If you're not already stretching the lean end- the motor will probably run fine at least a mile on unmixed gas- especially if it already has a lot of miles.
I never usually go more than a couple of miles away- and my build is really more like a decent bicycle with afterburners. I have the seat at near mormal height, but have thought about getting a quick release seat bolt to be able to adjust it.
But here in Jacksonville, they really have an excellent bus system- if I ever decide to ride to say, the beach- 22 miles away- and the bike breaks down, I'll lock it up, take the bus home, and go back to pick the bike up in my car.
Beach Baby Beach Baby, give me a hand...