Doesn't it seem odd that we drag several thousand pounds of steel around with us when we drive to work or school? Obviously, this is a very inefficient way to move a person from one place to another. A simple alternative is to ride a bike. However, sometimes the bike ride is too time consuming or too draining to be done daily. The return half of my commute requires a 10 mile ride up a steep hill which is more than I can manage on a regular basis. The solution that I have found is to add a motor (1.6 hp 35cc four stroke Subaru/Robins) to my bike. I get some exercise by not using the engine on the way in or for the first three relatively flat miles of the return. Then, when the hill gets steep I start up the motor and let it take me home. This brings the time (about 40 minutes each way) and effort of the commute into an acceptable range. On the flat, the motor propels the bike at about 25 mph. As a "human-gas" hybrid I have been averaging about 400 miles per gallon of gas. Compared with driving my car, I save about 4 gallons of gasoline a week along with the associated emissions.