Very cool. My DD was a 73(?) Honda CB350-4 many many years ago. I picked it up for $100, replaced the battery, tires, and the muffler, and ran the hell out of it. I would get 50-60 mpg trying to qualify on pole.
I've been wanting another, and riding season is starting here. Hmm...
To glide you need momentum and low friction. I don't think that pumping up a bike tire is as good of an idea as a car tire, since blowouts can be a big problem. Momentum is mass * velocity, so with your low mass, low momentum.