Then they could test response on Color & Model before going National and then International.
P.S. Let's not forget having some split testing with Bikini Models in the passenger seat waiting for the prospect. Then split test that with bikini color and BOOB SIZE!!!
Once Bikini color and Boob Size has been optimized it would be time to have the women washing & waxing the car and maybe even in some revealing mechanic outfits.