Table of Contents
Why measuring is part of the job, not an option
The essential metrics of a VLA campaign
How to interpret each metric in the context of a dealership
Signs that the campaign needs adjustment
Where to find the data: Google Ads, Merchant Center and Analytics
How often to review and what to do in each review
The metric that matters most: cost per lead vs cost per sale
Frequently asked questions
Why measuring is part of the job, not an option
A Google Vehicle Ads campaign that is not measured can be performing well or poorly: without data, there is no way to know. But more importantly, without measurement there is no way to improve it. The Performance Max algorithm that manages VLAs learns and optimises over time, but only if it receives clear conversion signals: which clicks ended in a lead, which did not, which vehicle listings convert best and which ones bounce.
The dealership that measures has three concrete advantages. Firstly, they can identify if the budget is generating leads at a reasonable cost or if there is a problem somewhere in the funnel. Secondly, they can scale the investment with confidence when the data confirms it is working. Thirdly, they can detect and correct issues before they consume budget for weeks with no result.
To understand the full context of how VLAs work before diving into metrics, you can review the complete Google Vehicle Ads guide for dealerships.
The essential metrics of a VLA campaign
Impressions. How many times your ad has been shown. A low number of impressions indicates that the budget is too limited, the feed has too few vehicles, or that relevant searches in your area have low volume.
Clicks. How many times someone has clicked on your ad to reach the vehicle listing. Clicks without conversions indicate that the ad is engaging but that the vehicle listing page or the contact process is not converting.
CTR (Click-Through Rate). The percentage of people who see the ad and click. It is calculated as clicks ÷ impressions × 100. In VLA, a healthy CTR ranges between 3% and 8% depending on the segment and competition. Below 2%, photos or relative pricing may be penalising the visibility and attractiveness of the ad.
CPC (Cost Per Click). What you pay on average for each click. In the Spanish used-vehicle market, typical CPC in VLA is between 0.30 and 1.50 euros. A very high CPC can indicate high competition in that segment or low quality of the feed.
Conversions. The number of desired actions completed: form submitted, phone call initiated, booking completed. This is the most important metric because it connects advertising spend with actual business results.
Conversion rate. The percentage of clicks that end in a conversion. It is calculated as conversions ÷ clicks × 100. A rate below 3-5% usually indicates a problem with the vehicle listing page (too little information, no visible form, poor quality photos) rather than with the ad itself.
Cost per conversion (CPL — Cost Per Lead). The average cost of each lead generated. It is calculated as total investment ÷ number of conversions. This is the metric that allows you to compare VLA with other lead generation channels.
How to interpret each metric in the context of a dealership
VLA metrics are not interpreted in isolation: they must be cross-referenced to understand what is happening at each stage of the funnel.
High impressions, low clicks (low CTR). The ad is shown but does not attract clicks. The most common causes are poor-quality photos, price significantly above the market range for that model, or the ad appearing in irrelevant searches. Solution: review the quality of feed images and check the price positioning of vehicles with the highest impressions.
High clicks, low conversions (low conversion rate). The ad attracts users but the vehicle listing page does not convert. The most common causes are listings with little information, a contact form that is hard to find or poorly visible on mobile, slow page load times, or the price on the listing not matching the ad. Solution: review user experience on vehicle listing pages, especially on mobile.
Very high CPC. It can indicate high competition in that segment or low relevance of the feed for the searches triggering the ad. Solution: review the quality and completeness of the feed and assess whether there are vehicle segments with lower competition to concentrate the budget on.
Very high cost per lead. If the CPL significantly exceeds the cost of a lead on regular portals, the campaign is not being efficient. Solution: identify at which stage efficiency is lost (impressions, clicks, or conversions) and take action on that specific stage.
Signs that the campaign needs adjustment
You do not have to wait for negative data to act. These signs indicate that something needs reviewing:
The cost per lead rises steadily for two consecutive weeks. This may indicate that competition has increased in that period (other campaigns in the area) or that the quality of the feed has deteriorated (old photos, outdated prices).
The conversion rate drops without a change in investment. This generally indicates a problem on the vehicle listing page: a change in website design, a broken form, or vehicles that are no longer available but remain in the feed and generate clicks with no conversion potential.
Impressions drop significantly without a reduction in budget. This may indicate that the feed has too few new vehicles (the algorithm learns better with dynamic and varied stock) or that Google has detected problems in the feed during validation.
The learning period does not end. If after four weeks the campaign continues to show the "learning" notice in Google Ads, the volume of conversions is insufficient for the algorithm to optimise. Solution: lower the conversion threshold (use micro-conversions like visits to the contact page) or increase the daily budget.
To improve the quality of vehicle listings that receive clicks, you can review the guide on how to stand out with your cars on portals.
Where to find the data: Google Ads, Merchant Center and Analytics
Google Ads is the main dashboard to manage and measure the campaign. Impressions, clicks, CTR, CPC, conversions, and cost per conversion metrics are available in the campaigns dashboard. The "Search terms" report (although limited in Performance Max) gives clues about the searches triggering the ads.
Google Merchant Center shows the status of the feed: how many vehicles are approved, how many have validation errors, and what types of errors are the most frequent. A feed with many rejected vehicles reduces campaign coverage. Checking feed errors weekly and fixing them is part of basic campaign maintenance.
To keep the feed always updated and avoid errors in Merchant Center, you can consult the guide on how to sync your dealership's stock with Google VLA.
Google Analytics 4 complements Google Ads data by adding information about user behaviour after the click: how much time they spend on the vehicle listing page, what percentage scrolls down to the form, what percentage leaves without interacting. For this data to be useful, the dealership's website must have GA4 installed and conversion events correctly configured.
How often to review and what to do in each review
Weekly review (10-15 minutes). Verify that the campaign is active, that the daily spend is in line with the planned budget, and that the cost per lead has not suffered sudden changes. Check Merchant Center for any new errors in the feed.
Fortnightly review (30 minutes). Analyze the trend of key metrics (CTR, conversion rate, CPL) comparing with the previous two weeks. Identify vehicles with the most clicks and verify that their listing pages are in good order. Update prices in the feed if there are cars that have changed prices on portals.
Monthly review (1 hour). Compare the cost per lead from VLA with the cost per lead from traditional portals. Evaluate if the budget distribution across campaigns (if there is more than one) is optimal. Decide whether to scale up investment or adjust the strategy for the following month.
If you want to delve deeper into how to integrate these metrics with other business indicators, you can consult the guide on essential KPIs for used car dealerships.
The metric that matters most: cost per lead vs cost per sale
Cost per lead is the most commonly used indicator to evaluate VLA performance, but the most relevant one for investment decisions is the cost per sale: how much the advertising cost you to close each sale.
If a VLA lead costs 5 euros and the lead-to-sale conversion rate is 20%, the cost per sale is 25 euros. If a lead from Coches.net costs 12 euros but the conversion rate is 15%, the cost per sale is 80 euros. In this scenario, VLA is more efficient even if its CPL is lower than the CPC of the portals.
To calculate the cost per sale, you need to track where each lead that ended in a sale came from. Without that tracking, you can only compare CPL between channels, which is a valid but incomplete indicator.
If you want to better understand how to connect investment in VLA with the dealership's complete digital strategy, you can download the free Google VLA guide for dealerships.
More than 750 dealerships already use Dealcar to manage their daily operations
Dealcar integrates Google Vehicle Ads data with the dealership's stock and operations, allowing the cost per lead and cost per sale to be calculated by channel automatically.
Activate and manage Google VLA with Dealcar. More information at dealcar.io/dealcar-boost.
With that vision available without additional manual work, decisions on how much to invest in VLA and when to scale are made with real data.
If you want to see how it works, you can book a free demo at dealcar.io.
Frequently asked questions
How many conversions do I need per month for the algorithm to work well?
Google recommends a minimum of 30-50 conversions per month for Performance Max to optimise effectively. If you do not reach that volume with form conversions, you can add micro-conversions (visits to the contact page, clicks on a phone number) to give more signals to the algorithm, even if their informational value is lower.
How do I know if the problem is with the ad or with the vehicle listing page?
If the CTR is normal but the conversion rate is low, the problem is with the listing page (after the click). If the CTR is low, the problem is with the ad or the price of the vehicle (before the click). This distinction determines what needs to be corrected.
Is it normal for the cost per lead to vary significantly from week to week?
Yes, especially in the first weeks of the campaign (learning period). Once the algorithm stabilises (normally from the third or fourth week onwards), week-on-week variations should be smaller. Sharp variations after that period usually indicate changes in competition or feed quality.
Are Google Ads conversion data reliable?
They are reliable if conversions are correctly set up. A common error is counting visits to the form thank-you page as conversions without verifying that the form was actually submitted. For more precise data, cross-reference Google Ads data with the leads registered in your CRM or management system.
Table of Contents
Why measuring is part of the job, not an option
The essential metrics of a VLA campaign
How to interpret each metric in the context of a dealership
Signs that the campaign needs adjustment
Where to find the data: Google Ads, Merchant Center and Analytics
How often to review and what to do in each review
The metric that matters most: cost per lead vs cost per sale
Frequently asked questions
Why measuring is part of the job, not an option
A Google Vehicle Ads campaign that is not measured can be performing well or poorly: without data, there is no way to know. But more importantly, without measurement there is no way to improve it. The Performance Max algorithm that manages VLAs learns and optimises over time, but only if it receives clear conversion signals: which clicks ended in a lead, which did not, which vehicle listings convert best and which ones bounce.
The dealership that measures has three concrete advantages. Firstly, they can identify if the budget is generating leads at a reasonable cost or if there is a problem somewhere in the funnel. Secondly, they can scale the investment with confidence when the data confirms it is working. Thirdly, they can detect and correct issues before they consume budget for weeks with no result.
To understand the full context of how VLAs work before diving into metrics, you can review the complete Google Vehicle Ads guide for dealerships.
The essential metrics of a VLA campaign
Impressions. How many times your ad has been shown. A low number of impressions indicates that the budget is too limited, the feed has too few vehicles, or that relevant searches in your area have low volume.
Clicks. How many times someone has clicked on your ad to reach the vehicle listing. Clicks without conversions indicate that the ad is engaging but that the vehicle listing page or the contact process is not converting.
CTR (Click-Through Rate). The percentage of people who see the ad and click. It is calculated as clicks ÷ impressions × 100. In VLA, a healthy CTR ranges between 3% and 8% depending on the segment and competition. Below 2%, photos or relative pricing may be penalising the visibility and attractiveness of the ad.
CPC (Cost Per Click). What you pay on average for each click. In the Spanish used-vehicle market, typical CPC in VLA is between 0.30 and 1.50 euros. A very high CPC can indicate high competition in that segment or low quality of the feed.
Conversions. The number of desired actions completed: form submitted, phone call initiated, booking completed. This is the most important metric because it connects advertising spend with actual business results.
Conversion rate. The percentage of clicks that end in a conversion. It is calculated as conversions ÷ clicks × 100. A rate below 3-5% usually indicates a problem with the vehicle listing page (too little information, no visible form, poor quality photos) rather than with the ad itself.
Cost per conversion (CPL — Cost Per Lead). The average cost of each lead generated. It is calculated as total investment ÷ number of conversions. This is the metric that allows you to compare VLA with other lead generation channels.
How to interpret each metric in the context of a dealership
VLA metrics are not interpreted in isolation: they must be cross-referenced to understand what is happening at each stage of the funnel.
High impressions, low clicks (low CTR). The ad is shown but does not attract clicks. The most common causes are poor-quality photos, price significantly above the market range for that model, or the ad appearing in irrelevant searches. Solution: review the quality of feed images and check the price positioning of vehicles with the highest impressions.
High clicks, low conversions (low conversion rate). The ad attracts users but the vehicle listing page does not convert. The most common causes are listings with little information, a contact form that is hard to find or poorly visible on mobile, slow page load times, or the price on the listing not matching the ad. Solution: review user experience on vehicle listing pages, especially on mobile.
Very high CPC. It can indicate high competition in that segment or low relevance of the feed for the searches triggering the ad. Solution: review the quality and completeness of the feed and assess whether there are vehicle segments with lower competition to concentrate the budget on.
Very high cost per lead. If the CPL significantly exceeds the cost of a lead on regular portals, the campaign is not being efficient. Solution: identify at which stage efficiency is lost (impressions, clicks, or conversions) and take action on that specific stage.
Signs that the campaign needs adjustment
You do not have to wait for negative data to act. These signs indicate that something needs reviewing:
The cost per lead rises steadily for two consecutive weeks. This may indicate that competition has increased in that period (other campaigns in the area) or that the quality of the feed has deteriorated (old photos, outdated prices).
The conversion rate drops without a change in investment. This generally indicates a problem on the vehicle listing page: a change in website design, a broken form, or vehicles that are no longer available but remain in the feed and generate clicks with no conversion potential.
Impressions drop significantly without a reduction in budget. This may indicate that the feed has too few new vehicles (the algorithm learns better with dynamic and varied stock) or that Google has detected problems in the feed during validation.
The learning period does not end. If after four weeks the campaign continues to show the "learning" notice in Google Ads, the volume of conversions is insufficient for the algorithm to optimise. Solution: lower the conversion threshold (use micro-conversions like visits to the contact page) or increase the daily budget.
To improve the quality of vehicle listings that receive clicks, you can review the guide on how to stand out with your cars on portals.
Where to find the data: Google Ads, Merchant Center and Analytics
Google Ads is the main dashboard to manage and measure the campaign. Impressions, clicks, CTR, CPC, conversions, and cost per conversion metrics are available in the campaigns dashboard. The "Search terms" report (although limited in Performance Max) gives clues about the searches triggering the ads.
Google Merchant Center shows the status of the feed: how many vehicles are approved, how many have validation errors, and what types of errors are the most frequent. A feed with many rejected vehicles reduces campaign coverage. Checking feed errors weekly and fixing them is part of basic campaign maintenance.
To keep the feed always updated and avoid errors in Merchant Center, you can consult the guide on how to sync your dealership's stock with Google VLA.
Google Analytics 4 complements Google Ads data by adding information about user behaviour after the click: how much time they spend on the vehicle listing page, what percentage scrolls down to the form, what percentage leaves without interacting. For this data to be useful, the dealership's website must have GA4 installed and conversion events correctly configured.
How often to review and what to do in each review
Weekly review (10-15 minutes). Verify that the campaign is active, that the daily spend is in line with the planned budget, and that the cost per lead has not suffered sudden changes. Check Merchant Center for any new errors in the feed.
Fortnightly review (30 minutes). Analyze the trend of key metrics (CTR, conversion rate, CPL) comparing with the previous two weeks. Identify vehicles with the most clicks and verify that their listing pages are in good order. Update prices in the feed if there are cars that have changed prices on portals.
Monthly review (1 hour). Compare the cost per lead from VLA with the cost per lead from traditional portals. Evaluate if the budget distribution across campaigns (if there is more than one) is optimal. Decide whether to scale up investment or adjust the strategy for the following month.
If you want to delve deeper into how to integrate these metrics with other business indicators, you can consult the guide on essential KPIs for used car dealerships.
The metric that matters most: cost per lead vs cost per sale
Cost per lead is the most commonly used indicator to evaluate VLA performance, but the most relevant one for investment decisions is the cost per sale: how much the advertising cost you to close each sale.
If a VLA lead costs 5 euros and the lead-to-sale conversion rate is 20%, the cost per sale is 25 euros. If a lead from Coches.net costs 12 euros but the conversion rate is 15%, the cost per sale is 80 euros. In this scenario, VLA is more efficient even if its CPL is lower than the CPC of the portals.
To calculate the cost per sale, you need to track where each lead that ended in a sale came from. Without that tracking, you can only compare CPL between channels, which is a valid but incomplete indicator.
If you want to better understand how to connect investment in VLA with the dealership's complete digital strategy, you can download the free Google VLA guide for dealerships.
More than 750 dealerships already use Dealcar to manage their daily operations
Dealcar integrates Google Vehicle Ads data with the dealership's stock and operations, allowing the cost per lead and cost per sale to be calculated by channel automatically.
Activate and manage Google VLA with Dealcar. More information at dealcar.io/dealcar-boost.
With that vision available without additional manual work, decisions on how much to invest in VLA and when to scale are made with real data.
If you want to see how it works, you can book a free demo at dealcar.io.
Frequently asked questions
How many conversions do I need per month for the algorithm to work well?
Google recommends a minimum of 30-50 conversions per month for Performance Max to optimise effectively. If you do not reach that volume with form conversions, you can add micro-conversions (visits to the contact page, clicks on a phone number) to give more signals to the algorithm, even if their informational value is lower.
How do I know if the problem is with the ad or with the vehicle listing page?
If the CTR is normal but the conversion rate is low, the problem is with the listing page (after the click). If the CTR is low, the problem is with the ad or the price of the vehicle (before the click). This distinction determines what needs to be corrected.
Is it normal for the cost per lead to vary significantly from week to week?
Yes, especially in the first weeks of the campaign (learning period). Once the algorithm stabilises (normally from the third or fourth week onwards), week-on-week variations should be smaller. Sharp variations after that period usually indicate changes in competition or feed quality.
Are Google Ads conversion data reliable?
They are reliable if conversions are correctly set up. A common error is counting visits to the form thank-you page as conversions without verifying that the form was actually submitted. For more precise data, cross-reference Google Ads data with the leads registered in your CRM or management system.
