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If it's really recent, the engine could just be that tight. (i.e. between the rings and the bore)
A rebuilt engine creates a pile of heat for the first few hundred miles, until things are mated correctly, and more fluid. Also, all that extra friction does destroy fuel mileage.
Personally, on a fresh 4 stroke motor-cycle engine I like to throw some 2 stroke oil in the fuel, and a bottle of EOS (A ZDDP additive) just to try to soothe the hot spots, until things get broken in some...
--Vince
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"Sometimes it is better to say nothing, and let people think you're an idiot, than to open your mouth and prove it."
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