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My vento only gets about 60 miles per gallon. A 2 stroke engine is not as fuel efficent as a 4 stroke engine. My Tao Tao got about 90 miles per gallon but it was a 4 stroke engine. If your oil pump does not work or quits working you will find out right quickly as the engine will seize up. Adding 50 to 1 fuel will not really affect gas mileage a noticable amount but it may cause your engine to run a little on the lean side.
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