I filled the gas tank for my two-stroke at the Chevron station. Instead of carrying reserve fuel in my aluminum bottle, I always pour two ounces of oil into it. When I pull into the gas station, I close the petcock, pour the oil into the tank and pump in .75 gallon of 87 octane. Then I pedal in the grass for a block. That mixes the fuel; then I stop, open the petcock and start the engine. The engine's sparkplug looks ok, so the mixture must be all right.
Nowadays, all I do is fill gas, check air, clean the bike and tighten loose bolts.
In the rebuilding process is a recently-purchased, Mitsubishi-powered Trek w/ Staton drive and NuVinci hub. This motorized bicycle had been sitting/neglected for three years. Surprisingly, it started right up with a fresh tank of gas.