my moped uses one quart of oil every 2,500 miles, in a car it's considard acceptable if it burns a quart of oil between 3,000 mile oil changes, burning oil that is not designed to be burnt, as opposed to the moped oil that is designed to burn clean (smokeless, low soot, synthetic 2 stroke oil).
I also have plans, as soon as I get my paper work for my new moped, to start running 10% bio-diesel insted of the 2 stroke oil, mixed with the gas, from my short turm tests last summer it didn't create any problems with my 4 stroke over the course of about 500 miles, so we will see how the compression holds up on a moped, I figure it's ideal because replacement parts are cheap and easy to get, so burning up a pistion or a set of rings might set me back $50 at the most, but I'm pretty confident that it will work without engine damage for thousands of miles.
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