For businesses · 7 min read · Updated October 2026

Car Advertising ROI: How a Small Business Should Actually Think About It

Reach media doesn't produce click reports, so measure like an operator: cost per estimated impression, an attribution floor from codes, and customer value doing the math.

The honest answer first: car advertising is reach media, and reach media will never hand you a dashboard that says 'this sticker produced $3,212 in sales.' Neither will a billboard, a bus wrap, or the sponsorship banner at the rink — yet businesses buy all of them profitably, because reach has a real ROI; it just has to be reasoned about instead of read off a screen. This article is the operator's framework for that reasoning: what a Lunar campaign costs per unit of exposure, how to build an attribution floor you can actually count, and how customer lifetime value turns a $500/month campaign into a break-even math problem a napkin can solve.

Step one: know your cost per unit of reach

A Half Moon campaign is $500/month for your sticker on 2 verified cars; Full Moon is $1,500/month for 7 cars — $214.29 a car against $250 (pricing). Your dashboard reports estimated impressions, built from photo-verified miles times an impressions-per-mile rate, scaled down honestly for a door circle and weighted by zone density. Divide monthly spend by monthly estimated impressions and you have a cost per thousand impressions (CPM) — the same currency billboards, transit and radio quote. Two things make Lunar's version of that number unusually trustworthy: it's anchored to verified driving (odometer photos, install verification), and it's deliberately conservative — the visibility factor scales a door circle DOWN from full-wrap assumptions. When you compare against a billboard quote, you're comparing a measured-input estimate against a traffic average.

Step two: respect what repetition is worth

Raw CPM undersells the thing neighbourhood campaigns do best. A highway billboard shows you once to 50,000 strangers driving through; a zone-matched car shows you 40 times to the same few thousand households who can actually buy from you. Marketing has known for a century that familiarity compounds — the name seen weekly for a season becomes the default when the need arrives. That's why the right mental model for a Lunar campaign isn't 'tiny billboard' but 'recall subscription for my service area': you're buying position in the neighbourhood's memory, and memory is what converts when someone's water heater dies or Friday feels like pizza. Reach inside your radius is worth more per impression than reach outside it.

Step three: build the attribution floor

• Put an offer code of your own on the sticker ('DOOR10'): every redemption is a directly attributable sale. Codes undercount badly — most people who see the sticker and later buy never mention it — so treat redemptions as the floor of the campaign's effect, never the whole of it.
• Add a QR to a trackable page: scans and the sales that follow are floor number two.
• Ask every new customer how they heard about you, and log it. 'I keep seeing you around' is sticker attribution in its natural form.
• Watch the trend lines that don't lie: new-customer counts, calls, direction requests on your business profile, plotted against campaign phases. Reach shows up as a tide, not a tracer.

Step four: let customer value do the heavy lifting

Here's the napkin. Take YOUR average customer value — not an industry benchmark, your books: what a new customer spends with you in a year. Divide monthly campaign cost by that number and you have your break-even count: how many new customers a month the campaign must produce to pay for itself. For most service and food businesses that math lands between 'one' and 'a handful' — a $500/month campaign carried by a business whose average customer is worth a few hundred dollars a year needs roughly one to two attributable new regulars a month to break even, and everything the floor can't see (the undercounted code, the 'saw you around' that nobody mentions) is upside. Run the same calculation on any channel you buy and you'll make better decisions everywhere — this framework isn't Lunar's; it's just arithmetic Lunar happens to survive.

Step five: judge on the right clock

• Evaluate on a 3-month phase, not a week: recall builds with repetition, and campaigns are structured in phases for exactly this reason. Billed monthly, never pre-charged, so the evaluation risk is bounded.
• Expect the response curve to tilt late: the first weeks buy familiarity, the later weeks harvest it. A campaign judged at day 20 is being graded mid-sentence.
• Compare like with like: a lead-gen ad and a reach campaign do different jobs. The fair comparison for Lunar is the other reach you could buy — billboard, transit, radio, mailers — per dollar, inside your actual service radius.
• Count the costs that aren't there: no design agency (the sticker is printed for you), no commitment beyond the term you choose (3 or 6 months), and a 6-month term takes 10% off every month if you want to commit.

What we won't claim

No guaranteed sales, no 'views' dressed up as customers, no ROI calculator with suspiciously smooth defaults. Impressions are estimates and labelled that way; attribution floors are floors; the lift between the two is real but unphotographable — same as every reach medium humans have ever bought. What Lunar adds to the old deal is verification (real cars, photographed installs, odometer-checked miles) and neighbourhood precision (zone matching), which together mean the reach you're reasoning about actually happened. That's more than a billboard has ever promised you.

The bottom line

Think of car advertising ROI as three numbers you own: cost per thousand verified-mile impressions (compare it to any reach quote), the attribution floor your code and QR count (the minimum it's working), and the break-even customer count your own books define (the bar it must clear). If those three stack up — and inside a tight service radius they usually do — run a phase and judge it like an operator. How it works covers the launch; the napkin math above covers the decision.