How to Revive an Old Motorcycle: Save Money on Gas/Fuel! Cheap Ride!
This link is to a piece I did a few years ago for instructables.com. It is very basic, but makes for a good starting place for those who are new to wrenching on two-wheelers. It is certainly not specific to fuel economy (as a couple of bikes in the pictures are horribly inneficient), but it shows that just about any literate person can rescue an unwanted motorbike, and save a few bucks at the same time.