I think we need questions about driving speed and fuel consumption on the written test to get a driver's license so we make sure that people really understand how speed affects their fuel consumption.

Just did some quick calculations. Speeding up from 55 to 75 mph is a 35% increase in speed. But it's an 85% increase in air resistance! A lot of people routinely drive 80 mph on the freeway. Compared to 55 mph, that's 110% more air resistance--more than double the resistance that your engine has to push through the air.

Maybe we should outlaw windshields so everyone can feel for themselves how much wind resistance they're trying to overcome when they stomp on the gas pedal.