In the June National Geographic, there is piece on a day without driving. Using Pittsburgh as an example it claims that if more people use public transportation, carpools and drive the speed limit they would save 213,700 gallons of gas. It was unclear if this was for a day or a year. Now I'm not to sure how realistic parts of "eco-friendly" driving are in real world commuting traffic, but overall the suggestions seem to be such miniscule changes to ones life that at worst they would qualify as inconvenient.
Inconvenience does not equal sacrifice. This is sacrifice.