Which AI Tools Do GM Dealers Show Up in? An Analysis of 6 Top LLMs.

Being cited by one AI tool doesn't mean you're cited by the others. We checked 4,846 Chevrolet, Buick, GMC and Cadillac dealer websites in the US across six AI engines. About one in four was cited by all six. Nearly one in five was cited by none.

The clearest predictor of how many engines cite a store was the same one we keep finding: organic search reach. Stores that already earn search traffic show up across AI search. Stores that don't, mostly don't.

How We Measured It

• Sample: the same 4,846 GM dealer websites from our OEM Deep Dive. We started with every rooftop in GM's dealer locator on Oct. 19, 2026, followed each website to its live address, and removed rooftops with no website and sites whose live address we couldn't confirm.

• Engines: Google AI Overviews, Google AI Mode, Gemini, Perplexity, Microsoft Copilot and ChatGPT. Ahrefs supplied US citation counts for each one in October 2026.

• How to read it: Ahrefs samples each engine differently. AI Overviews are counted from tracked Google searches. The other five are counted from questions Ahrefs asks them. Compare patterns, not exact totals, and treat the results as a snapshot.

Finding #1: Each AI Plays by Its Own Rules

Every engine cites a different share of GM dealers, and every one cites fewer GM dealers than Ford dealers.

23% of GM dealers were cited by all six engines. 19% were cited by none. For Ford dealers, those numbers were 32% and 10%.

Depth varies too. Among GM dealers cited by AI Overviews, the typical store had four different pages cited. For ChatGPT, the typical store had two.

What this means for you: Checking one tool doesn't tell you where you stand across all of them. And the more pages you have that answer real shopper questions, the more ways each engine has to cite you.

Finding #2: Google's 3 AIs Stick Together, and Perplexity Joins Them

AI Overviews, AI Mode and Gemini are all Google products. AI Overviews and AI Mode are built into Google Search, and Gemini can use it too. So we checked how closely each pair of engines agrees on which GM dealers to cite.

We used a Spearman correlation, where 1 means perfect agreement and 0 means none. Rough guide: 0.7 and up is strong, 0.4 to 0.7 is moderate, and below 0.4 is weak.

Perplexity isn't a Google product, but for GM dealers it agrees with Google's AIs almost as closely as they agree with each other. The same was true for Ford.

We also compared each engine's citations with the number of searches each dealer ranks for in Google:

ChatGPT's lower score is partly because 54% of GM dealers had no ChatGPT citations at all.

What this means for you: Strong Google rankings carry across most of AI search. Four of the six engines track Google rankings closely. ChatGPT and Copilot follow them least, and they're the ones to watch.

Finding #3: Your Search Reach Decides How Many AIs Know You

We split the 4,846 dealers into four groups of about 1,200 each by estimated monthly organic search visits, from Ahrefs. These estimates usually run lower than a store's own analytics.

Each step up in traffic brought more engines. In the lowest group, more than half of GM stores were invisible to all six. In the top group, four stores of 1,212 were.

Here's the same view, engine by engine:

The gap is widest outside AI Overviews and Perplexity. In the lowest group, AI Mode, Gemini, Copilot and ChatGPT each cited 14% of stores or fewer. In the highest group, every engine cited at least 77%.

Ranking keywords tell the same story. Every GM store that ranks for 100 or more searches is cited by at least one engine. Among stores ranking for 150 or more, 69% are cited by all six.

One caution: high-traffic stores tend to be larger, have more pages and sit in bigger markets. The data shows these things move together. It doesn't show that one causes the other.

What this means for you: Growing organic search traffic is the same work that puts your store in front of more AI engines. GM stores estimated at 60 or fewer monthly search visits are cited by fewer than one engine on average.

What We Are Not Claiming

A few limits, stated plainly.

• Correlation, not a controlled test. Search reach and AI citations may both come from the same thing: a useful, well-built site.

• AI results change daily. This data reflects one moment in October 2026.

• ChatGPT and Copilot data is thin. About three in four GM dealers have zero or one citation in each.

• Six engines, not all of them. Claude and Grok were not included.

Where This Leaves Your Store

AI search isn't one place. It's at least six, and each one decides on its own whether to cite your store. The GM stores that show up in most of them have one thing in common: strong organic search reach.

A Search-to-Sale Audit shows what shoppers find when they search for your store, your brand and your models across Google, AI search and local results.

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