Their ad on your car.

• Position: ADVERTISING

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Some companies pay millions to put their logos on Dale Earnhardt Jr.'s race car, but others might prefer to pay for space on your car. In fact, tens of thousands of drivers have had their vehicles wrapped in advertisements in exchange for up to $800 a month. But they must be willing to abide by certain rules: People whose cars are wrapped in Coca-Cola ads, for example, can't be seen sipping a Pepsi behind the wheel. Drivers can't smoke, curse, or litter and...