Yes, Comrades, you polluting less and use less fuel now. More fuel efficient vehicle mean less emission. However, there is problem. You not paying enough tax to pay for government. Now we need to tax you for miles driven. You see, government get money from gas tax to pay for roads. You no buy gas, we no get money. So now, we tax you by the mile, so even if you buy small car to save money, we still get ours. This applies to citizens of The People's Republic's of California, New York, Colorado, and other like minded Soviets.