We all think our Claritys get great gas mileage, right? They get about 40 mpg, meaning they burn about 3 oz of gas in a minute to go 1 mile. However that same amount of energy powers our bodies typically for 480 times as long, about 8 hours. (1 kcal = about 4 BTUs) Think of all the stuff we can do in 8 hours, walking, carrying, dancing, working, cooking. (Yes we have only 1 fuel in common, ethanol, but calories are calories) The question becomes why must even these efficient vehicles suck up so much fuel, when they weigh only 25 times as much as us and have the advantage of a very smooth wheel based propulsion system versus our rickety legs? I want to be a good custodian of the environment, so until we figure out how to do REAL automotive efficiency I leave the car at home and walk or ride a bike whenever possible.