By moving the fuel line to a clear plastic bottle with marked levels, and the iphone GPS you could easily see how much fuel this bad boy guzzles.
I'd bet using a smaller rear sprocket will increase FE.
Check your spark plug after a run to see if you can lean it up with an adjustment or main jet.
I'm used to 80cc 2 strokes that do 80mph so this is a very detuned setup....
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