Charge the rich more for gasoline

There has to be a way to charge the greedy people who want their vehicles to be big and flashy so we all know they have money more for gasoline.

Since they are so rich, why don't we have a higher price for the gluttons who drive around in Hummers and huge sport utility vehicles with only themselves inside? Let's charge them $8 a gallon so those who conserve can go back down to regular prices.