I've been thinking this over.... seems that we are all bashing our heads in trying to find more fuel efficient solutions...... while we already have scooters and motorcycles that can churn out over 65-70mpg easily (some of which are in the 80+ range) without the complexity of hybrids and emit a minute fraction of what even some of the cleanest cars will. The only reason I can find for not having a scooter/bike if you are truly concerned about carbon footprint/fuel efficiency would be protection from the rain and a/c .