+1 on the 2-strokes! There is nothing like a 2-stroke when it hits the pipe. Not that I own one anymore....
I did fix an RD350 for my neighbour. What a blast! Basically, way too much power for the chassis.
A stock RD will only get around 40-45 mpg.
The number one upgrade for these engines is digital ignition. The later RD400s had CDI which basically eliminated spark plug fouling issues. With a stock RD, you basically have to take a handful of spark plugs along at all times. There was a company that made a timing advance setup for these as well, which basically doubled fuel mileage around town. I would seriously look into that, because I believe there was no timing advance on these motors. I think it even had a TPS for timing inputs.
Good luck!
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