The Customer Who Buys a Car Is Already Listening to Radio on the Way to Your Lot

Car buying is one of the most researched purchases a consumer makes. They compare trims, read reviews, check inventory online, and spend weeks in consideration before stepping onto a lot. Given all that digital activity, it seems logical that digital advertising should dominate the auto media mix.

It's a reasonable assumption. It's also not what the large-scale attribution studies show.

The Largest Radio Attribution Study Ever Done in Auto

LeadsRx, working with iHeartMedia, conducted a comprehensive study measuring the web traffic impact of radio advertising across auto dealers. The scale makes it difficult to dismiss:

The methodology matters here: LeadsRx tracked website visits in the minutes immediately following each radio spot airing, across 1.8 million individual data points. A 17% average web traffic lift across 310 dealers is not a rounding error. It's a consistent signal at scale.

And the dealers who committed to higher frequency saw dramatically stronger results:

The implication is direct: frequency is not just a budgetary decision. At sufficient volume, radio doesn't just nudge awareness. It drives measurable search and site activity that shows up in your analytics as organic traffic.

Who Is Actually Listening, and Where

The most important structural fact about radio and auto advertising is where AM/FM listening happens. Edison Research's Q4 2025 Share of Ear data shows that 53% of all AM/FM radio listening now occurs in vehicles, an all-time high.

Think about what that means for an auto dealer. Your most likely buyer, someone who owns a car, drives regularly, and is exposed to road conditions and vehicle performance every day, is your radio audience. They're listening in the same environment your product operates in.

The connection goes further. People who drive more are more likely to be in the market. Edison's data shows that heavy drivers are 36% more likely to purchase a new vehicle than light drivers. The audience with the highest purchase intent happens to be the one with the highest radio exposure.

What CMOs Think vs. What the Data Shows

Here's the disconnect that costs auto dealers money: marketing executives consistently underestimate radio's effectiveness, even when the numbers tell a different story.

Circana's research on CMO perceptions found that radio ranks last among major media in perceived effectiveness, yet places second in actual measured ROI across product categories. The gap between perception and performance is wider for radio than for any other medium in the study.

This matters in auto because dealers typically allocate budgets based on what feels accountable. Digital gets a large share because every click is traceable. Radio gets underfunded because attribution is harder to see in real time. The attribution methods that close this gap are more accessible than most dealers realize, but they require a willingness to measure beyond last-click.

The Dealer Spend Trend Is Already Shifting

Radio's share of auto advertising spend has been growing, not shrinking. In 2023, radio nearly tied television as the leading medium for auto dealer advertising, and radio's share grew 26.5% year-over-year. That growth isn't driven by sentiment. It's driven by dealers who ran the numbers and reallocated accordingly.

The dealers increasing radio investment aren't abandoning digital. They're recognizing that radio and digital work together in a way that makes both channels more efficient. Radio builds the awareness that makes someone type your dealership name into Google. Google gets the credit. The dealer who understands the full chain does something different with their budget than the dealer who only looks at last-click attribution. Home services businesses face the same attribution distortion, and the dealers who've figured it out are pulling away from competitors who haven't.

What This Means for Treasure Valley Dealers

The Treasure Valley is a high-commute market. Ada County and Canyon County residents cover significant ground between Caldwell, Nampa, Meridian, Boise, and Eagle, often in the same day. That drive time translates directly into radio listening, and radio listening translates into the brand exposure that primes someone for a dealership visit.

For a dealer in this market, the question isn't whether your customers listen to radio. They do, and they're listening specifically in the context that most closely precedes a vehicle purchase: behind the wheel, every day, in the months leading up to when they finally decide to upgrade.

The dealers who are consistently in their ears during those months are the ones whose names come to mind first when the decision is made. That's not a brand awareness platitude. It's the mechanism the LeadsRx data is measuring. Awareness drives search. Search drives visits. Visits become sales.

Sources: LeadsRx / iHeartMedia auto dealer attribution study (310 dealers, 1.8M spots, 17 months). Edison Research Share of Ear Q4 2025, AM/FM in-vehicle listening share. Edison Research, heavy driver vehicle purchase propensity data. Circana CMO perception vs. actual ROI study, radio vs. other media. Radio Advertising Bureau / Katz Media, auto dealer radio spend growth data (2023 YoY). Cox Automotive, auto consumer digital research behavior data.