[Ptero]

The biggest single thing you can do is find NO ETHANOL gasoline. I just ran Hwy 6 from Bishop California to Chicago Illinois in a Smart Pure ForTwo pulling a Featherlite aluminum trailer. In Bishop, the Paiute Indian Casino has NO ETHANOL premium. I filled up there and drove to Ely Nevada. I used the simplest hypermiling technique of COASTING DOWNHILL, and the very simple CONSTANT THROTTLE technique, the slightly less-intuitive FOOT-OFF THROTTLE on very steep grades, CRESTING HILLS AT MINIMUM SPEED, MAX PSI SIDEWALL and NO BRAKING or AIR CONDITIONING.

Combined, these techniques rewarded me with 59.3 mpg.

NO ETHANOL - Ethanol robs about 30% MPG from engines tuned for gasoline.

Note: Some of these techniques can only be done safely in certain places and under certain circumstances by the observent and skilled.

CONSTANT THROTTLE - Hold your throttle constant for your chosen cruising speed on a level road and let the hill drag down your rpms. Shift into a lower gear without accelerating, hitting the max torque peak specific for your engine and letting the hill drag down your rpms until you downshift again to the same torque peak rpm for the next gear down. Never accelerate uphill. I'm talking torque, not horsepower. Horsepower is a different game and has nothing to do with hypermiling.

FOOT-OFF THROTTLE - Leaving the transmission in a high gear while descending steep grades cuts the injectors. It is safer but not as much fun (nor as effective in MPG) as squealing around blind corners in neutral with your passenger(s) screaming.

CRESTING HILLS AT MINIMUM SPEED - Technically speaking, any speed you carry over the top of a hill and into the next descent is wasted energy, provided by gas you didn't have to burn.

NO BRAKING - Same as above. Braking = wasted gasoline.

AIR CONDITIONING - ~17 horsepower in gasoline is lost during operation. Drive naked.