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A lot of fuel in a piston port 2T engine gets dumped unburned out of the exhaust port which is why a direct injection 2T that can wait until the exhaust is closed before putting in fuel will have much better fuel consumption.
A 2T generally has more than 1/2 the BMEP of a comparable 4T but has 2X the power strokes so you don't need as big of an engine to get comparable horsepower. The new Moto3 4T singles are probably not making any more (if as much) power than a 125GP 2T engine does.
cheers,
Michael
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