I don't understand the argument that if you buy an expensive car, you should expect to pay more for gas. Call me naive, but I don't understand why should all luxury cars run on premium gas. How are the 2 concepts - luxury and premium gas - related? I guess it stems from the fact that they try to put turbo-charged engines in those cars. But Honda Accord V6 produces more power than Mercedes C 230 without requiring premium gas.