A) Saving money 2% - I spend a LOT more money on groceries (and ethanol
) than I spend on gasoline and #2 middle distillate. And I'm single.
B) Reducing CO2 emissions 5%
C) Reducing pollutant emissions (CO, HC, NOx, PM, etc) 5%
D) A fun hobby 44%
E) Other (please specify) 44% - Bragging rights! When people ask me what I've done to my Mustang to exceed 30 MPG, I shrug and tell them, "I've driven it".