50cc 4 stroke scooters won't make 40 mph. Honda is fuel injected with a cat and an O2 sensor across the board on all their small bikes. They probably will do 140 mpgUS at 25 mph but where can you comfortably ride that slow in the US. Many of the air cooled 110cc bikes in India get close to 140 mpgat 30 mph and top out at 50.
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My tank fills are way more accurate on my bikes than in any car because you actually see the fuel at the top.
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The Swiss army knife of hypermiling motorcycles right now is the CBR250R. You can buy a used one in the paper for $3000. 90 mpgUS at 40 mph. Top speed of 92 mph. Occasional two up capable if you work at it and don't have hilly super highways.
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A used Honda PCX125 for $2500 has an automatic and can get 100 mpg at 40 mph but tops out at 60 mph.
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You can get a used Insight for $10,000 if you search nation wide that still runs good and get 60 mpgUS in traffic. A little more if it is not stop and go and you go extreme with a kill switch and a MIMA.
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