thank you... in many places road tax cheaters can get a BIG surprise in the mail come tax time. thank you... in many places road tax cheaters can get a BIG surprise in the mail come tax time.He’s not a tax cheat, he’s opting out of paying for a voluntary tax. People who use propane-powered cars don’t have to pay the gas tax. Neither do people who use propane or electric cars because the gas tax is a tax on gasoline itself, not on the roads. This will not hold up in court.