Overfuel put dealership websites from the nation’s top 50 dealer groups to the test. And they fared only slightly better than John Blutarski.

The dealership website provider’s second annual study checked the groups’ retail websites against Google’s Core Web Vitals performance benchmarks and found 0.4% of them passed both the mobile and desktop performance requirements — just a tick above the famous 0.0 grade-point average of Animal House’s Bluto, played by John Belushi.

Overfuel said it’s the second consecutive year the top dealer groups’ websites had a pass rate of less than 1%.

“Two years in a row, the data reaffirms: Dealerships have a massive opportunity to deliver the kind of online shopping experience customers actually want,” Overfuel president Alex Griffis said. “Shoppers are spending more time than ever researching vehicles online, and when sites are fast, stable and easy to use, the results are clear — happier customers, stronger engagement and more sales.

“The technology is here today, and the dealers who embrace it are already pulling ahead.”

The 2025 study examined 1,910 retail-focused websites tied to the top 50 dealership groups in North America, using real-world field data from the Google Chrome User Experience API and PageSpeed Insights collected Aug. 28-30.

Overfuel analyzed only retail websites actively displaying vehicle inventory. Collision, service, body shop and non-automotive sites such as powersports and RV were excluded.

Just seven websites passed Core Web Vitals on both mobile and desktop, while 99.6% failed on at least one platform, 95.5% failed on both, and 65 websites did not generate enough Google CrUX traffic to provide a performance score.

Google’s Core Web Vitals, introduced in 2020, measure load speed, interactivity and visual stability. Overfuel said websites that fail in those three essential aspects of performance frustrate consumers and risk lower search visibility in Google’s ecosystem, including search, maps, and AI-generated results.

The company said its research shows passing Core Web Vitals can boost organic website traffic by up to 20% while failing them can cause a comparable drop, and cited Shift Digital’s 2025 Digital Automotive Shopping Pulse Report’s finding that dealerships failing Google’s Core Web Vitals assessment effectively waste $30 of every $100 in advertising spend as a result of poor website performance.

“Too many dealers are overspending on ads just to push traffic into broken experiences,” Griffis said in Overfuel’s report. “When you fix the foundation, your marketing spend goes further. That’s the multiplier effect — performance isn’t just good UX, it’s better ROI.”

The report spelled out common problems that drag performance down, including outdated websites, poorly optimized pages and resources that slow interactivity, as well as ways to fix them.

Overfuel pointed out Jay Wolfe Honda in Kansas City, Mo., one of the seven dealerships that hit the Google benchmarks on both mobile and desktop, as a “clear example of what’s possible when dealerships prioritize speed, stability, and shopper experience.”

While running the OEM-recommended third-party tools and plugins, Jay Wolfe Honda recorded stronger search visibility, a 29% increase in organic traffic and a smoother, faster shopping experience, the report said.

“The message is clear,” Griffis said. “Better performance isn’t out of reach — it’s already happening. Dealers who modernize their digital storefronts are proving that fast, stable websites lead directly to more traffic, more leads and happier customers. The opportunity is enormous, and the technology to seize it is here today.”

The full report is available here.