high mpg

about 50% of a car's energy is used pushing it through the air. Why are we still driving square boxes?

here are the results for a typical internal combustion engine from Japan.
Honda Fit: 42mpg

aerodynamic - designed to slice through the wind rather than push ackwardly against it
lightweight - Honda Fit weight: 2540lbs vs. Ford Expedition: 5515lbs
engine tuning - add a good air filter to let the engine breathe
cruise control - keep it at 65-70 mph on the highway, and never, ever brake