Fuel-efficient vehicles are extremely important. Because we need to cut our fuel consumption and find other ways of powering cars, fuel-efficient vehicles are now very popular. Check out these great fuel-efficient vehicle articles from HowStuffWorks.
How the Air Car Works
As gasoline continues to lose its cachet as a reliable energy source, auto manufacturers have started to turn toward cleaner-burning fuels. However, they're still trying to figure out how to use the cleanest fuel of all -- the air we breathe.