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Exponential function anyone? I understand that the majority of people on this board who are above 35mpg are doing it for fun, but above that rate there's not a lot of money to be saved for the amount of effort involved. I was getting about 25mpg average last summer, id be ecstatic to hit 30mpg combined this summer, but above that i wouldn't save much money.
at my 300miles a week, id save about $30 a month going up to 30mpg. but going from 30 to 35mpg id only save an extra $20. if you made an astronomical leap from 50mpg to 80mpg average, you'd save just barely over $30 a month.
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