i don't think you are fully grasping the relationship between power and gas consumption...
more power = more gas consumption.
if you want more power and better gas consumption, simply buy a second bike that is very powerful. now you have power, and you have a bike that has good gas consumption... 70mpg is fairly ambitious without proper streamlining IMO, unless you want to cripple the bike.
liter bikes only get 40mpg when you have the throttle closed... try going fast on a literbike, you will quickly see that mpg drop like a brick
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