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I rode a Yamaha Daytona Special for a few years. It was a high performance version of the RD400, 2 stroke 400cc.
The service manual recommend replacing the pistons every 2500 miles! I could replace them in about an hour, what a pain.
I remember getting about 25 MPG, and it smoked alot, even with oil injection.
I think that barring a huge leap in 2 stroke technology, going with a 4 stroke is the best bet for fuel economy.
Remember when Al Gore was going to outlaw the 2 stroke engine?
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