When I was a kid, I used to get up to speed, then see how far I could go without pedaling on streets with no discernable downgrade in the direction I was traveling. I became quite adept at really low speed swerves to catch little slopes from the crown of the road and so forth.I remember this as being pretty damn fun and I think I made it an entire mile once, I may have to give it a shot as an old fart.