Quote:
Originally Posted by ProDigit
We now want to calculate our MPG gains.
If with our stock riding, we got 70MPG, mainly a mix of 3/4th city and suburbs, and 1/4th highway; our new MPG should come close to:
70MPG * 15/14 * 33/28 = 88MPG
The formula is derived from:
MPGstock * New front sprocket / stock front sprocket * stock rear sprocket / new rear sprocket)
We have gained an average of 18MPG compared to stock!!
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Playing with gearing is always fun, and I often think many people could benefit from it but are too afraid to play with changing it.
However, I don't understand the part I quoted above. MPG isn't a linear equation with rpm change, ie, cutting rpm in half doesn't necessarily double mpg. Just like a 8.5% change in gearing on my bike (geared down for off road) only netted about a 2% reduction in fuel economy riding the same route and habits commuting to work.