Just so you know,(and don't try it yourself), I tried to sell a do-it-yourself gas mileage improvement/dimple kit a year ago on Minneapolis craigslist, auto section. $50 for a ball-peen hammer. I posted pictures of the golf ball and it's aerodynamics, and the choice tool, and of a hail damaged car. Yes I meant it as a joke, but someone must have thought I was serious, because the ad was flagged and removed within about 10 minutes.

Nice to know my hypothesis had merit though.