Dealerships across the country are getting more from their digital ad budgets, not by spending more, but by spending smarter. Fullpath’s April 2026 Auto Intelligence Index—drawn from its Customer Data Platform and AI analytics across thousands of franchised dealerships nationwide—reveals a 37.3% year-over-year surge in dealership digital ad conversions. This is paired with a 14.8% drop in cost per lead (CPL)—the lowest CPL recorded in the past 12 months.
This leap in digital advertising efficiency is because dealerships are increasingly successful at using AI-powered automation. By targeting the most relevant audiences, automotive retailers are securing more qualified leads while spending less money per acquisition. Rather than relying on manual adjustments, dealers are increasingly using AI to shift spend in real time toward high-velocity inventory and service channels.
Google Search campaigns remain the backbone of dealership digital investment, accounting for 64% of total ad spend with an average CPL of approximately $28.50. Simultaneously, Google Performance Max (PMAX) is experiencing explosive growth. Dealership investment in PMAX climbed approximately 47% year-over-year from April 2025 to April 2026. This increased investment yielded extraordinary results: PMAX conversions increased by 119% year-over-year, while the associated Cost Per Lead decreased by over 33%.
What Happens After the Sixth Message
One of the more compelling findings from Fullpath was the “six-message threshold.” When a car shopper sends their sixth message to an AI-powered chatbot, their likelihood of converting increases by 6x—reaching a 45.6% conversion probability.
This is particularly interesting because normally we’d think that shoppers want to get in touch with a real person as quickly as possible, but as trust in AI is growing, today’s shoppers aren’t always looking for a quick hand-off to a sales rep. They want depth. They want answers. Dealerships that provide sustained, intelligent engagement through AI chat are the ones converting at the highest rates.
This shift is reflected in traffic trends as well. Dealerships saw a 34.5% surge in traffic originating from AI chat sources in March 2026. ChatGPT currently holds the majority of that traffic, but Google Gemini is gaining ground fast—growing from a 1.5% share of LLM-driven visits in Q4 2025 to 8.5% as of April 2026.
Where Dealers Are Shifting Their Investment
While new-vehicle advertising still commands the largest portion of dealership ad budgets, the fastest growth is happening elsewhere. Certified pre-owned (CPO) advertising investment jumped 69% year-over-year, fixed operations spend rose 57.4% and used inventory advertising climbed 27.8%.
“Dealer Near Me” campaigns also saw a notable 23.4% increase, as dealers continue to invest in local search visibility. In contrast, trade-in campaign spend dropped 17%.
Vehicle inventory is adding urgency to all of this. Average days supply fell nearly 14%, dropping from 95 days in late 2025 to 82 days in early 2026. Acura saw a 31.4% decline in inventory levels; Stellantis reduced supply by 25%. Vehicles are moving faster, and the margin for wasted ad spend is shrinking accordingly.
“The April Fullpath Auto Intelligence Index results confirm that we are entering a new era of ‘high-velocity’ automotive retail,” said Aharon Horwitz, CEO and Co-Founder of Fullpath. “Dealers are winning not by simply spending more, but by spending smarter and launching intelligent campaigns with the power of AI.”
The margin for error in digital advertising has effectively vanished. Automotive dealers who want to maintain a competitive advantage must adopt a data-centric approach to marketing. The fundamentals haven’t changed, but the tools available to execute them have. AI-powered automation, smarter audience targeting, and a deeper investment in conversational AI are becoming the new baseline for competing effectively.
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