A top-5 European OEM was launching a new mid-market EV sedan — sticker price €38K, positioned against Tesla Model 3 and BYD Seal. Their media mix was 71% paid social and search, but the internal team knew their problem wasn't reach. The problem was that nobody under 40 walked into the showroom thinking about them. Their internal benchmark was cost-per-qualified-showroom-visit at €182 (averaged across DACH paid media in 2025). Anything north of €240 was considered a fail. They came to us because their head of digital had read our methodology piece on attention-weighted CPM and wanted to know if YouTube tech reviewers could actually move showroom traffic, or if it was vanity.
We told them upfront: tech-creator CPMs would look terrible on a spreadsheet. The real question was whether 14-minute test drive reviews compress the consideration funnel enough to justify €40-80 CPMs.
What we forecast
Forecast engine output: predicted blended cost-per-qualified-showroom-visit of €198 (confidence interval €172 – €241, 80% band). Predicted total qualified visits: 2,800 – 3,400 across the four markets over 11 weeks, with a 6-week post-campaign decay tail (we've measured this on three prior auto campaigns — long-form YouTube content keeps converting for 38-52 days after publish).
Platform split reasoning: 78% YouTube long-form, 14% YouTube Shorts cutdowns, 8% Instagram Reels for creators who had cross-platform audiences. We deliberately excluded TikTok — our model has never produced a defensible CPA on TikTok for vehicles above €25K, the audience age skew and consideration mismatch is too wide.
Creator selection: we built a shortlist of 11 tier-1 tech/EV creators (200K – 1.4M subs) and ranked them by what we call "intent-density" — the % of comments on prior EV reviews that contained purchase-intent language. Top 6 had intent-density between 11% and 19%. Industry median is around 4%.
What we did
Final roster: 6 tier-1 creators (one each in DE x2, FR, NL, PL, plus one pan-European English-language reviewer). Format was 12-18 minute full reviews with a structured brief covering 4 mandatory talking points but full editorial control on tone. Two creators were given the car for 7-day extended loans rather than the standard 48 hours — those two had historically produced the highest-engagement reviews on competitor vehicles.
Attribution stack: each creator got a unique landing page with a "book a test drive" CTA. Showroom visits were matched via the dealer CRM using a 60-day cookie window plus a phone-number match on test drive bookings. We also ran a YouTube brand lift study in DE and FR for triangulation.
Timeline: 3-week creator onboarding and brief alignment, 6-week publish window (staggered), 2-week measurement tail before the D60 readout.
What happened
D60 final numbers: 3,180 qualified showroom visits at a blended cost of €217 per visit. That's 9.6% above our point forecast of €198, but inside the 80% confidence band. Total reach 8.2M, total watch time 71M minutes.
By-market breakdown: NL hit €174 (best — small market, high EV mindshare). DE came in at €223. FR at €241 (on the edge of our band). PL was the outlier at €312 — significantly worse than forecast. The PL creator delivered the views but Polish EV consideration is still 2-3 years behind Western Europe, and our model under-weighted that maturity gap.
Outlier on the upside: the pan-European English creator drove 31% of total qualified visits despite being 16% of spend. His audience over-indexed on DE and NL tech professionals — exactly the demographic that converts on EVs.
Key learning moment: the 7-day extended loan creators outperformed standard-loan creators by 2.4x on showroom visits per 1K views. The car needs time to become part of the creator's life on camera. A 48-hour drive review reads as sponsored content. A week-long integration reads as endorsement.
The lesson
Auto buyers don't convert from a single touch. They convert from a sequence of trust deposits, and long-form YouTube is the most efficient deposit format we've measured for vehicles above €30K. The CPM looks expensive until you measure the showroom conversion 45 days out. We've now seen this pattern hold across 4 EV campaigns and 2 ICE launches — short-form social drives awareness, long-form YouTube drives consideration, and you need both. The mistake is treating them as substitutes.
What it means for your campaign
If you're an auto, premium appliance, or any considered-purchase brand with AOV above €1,500 and a sales cycle longer than 30 days, you should be allocating 15-25% of your influencer budget to long-form YouTube with full editorial control. Do not run this playbook if your product is impulse-purchase or if you cannot tolerate creators saying mildly critical things on camera — the credibility is what makes it work.