Car Quids, which launches this weekend, will use strips on windscreens, rectangular stickers on doors and the bonnet, or a full wrap covering the entire car to display advertising. It expects average returns for drivers to be £100 per month but says this could rise to £200.
Oddly enough, some areas of the USA either EMBRACE this or EXCLUDE personal vehicle advertising for anything larger then a bumper sticker. One wold ave to check their local ordinances before proceeding. That said, any advertisers running this route will (obviously) look for the one or two (if that many) in any goo location to pay that kind of rate for a static (though mobile) billboard. Heck, I'd sign up in a jackrabbit minute!
i've read about the full wrap advertising model here in the US but i'm not sure how common it is. monthly rates are typically in the $1-500 range but i'm sure they install a tracker to verify your daily commute.