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If your muffler was tuned to give power down low in the RPM's I Imagine it would help your mpg , a bit , if you were to use the low RPMs you may save a fair amount.. I am thinking a port and polish with a slightly shaved head to remove restrictions and raise compression a few lbs. Also add a smaller rear sprocket or larger front sprocket to lower the rpm.
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Save gas
Ride a Mtn bike for errands exercise entertainment and outright fun
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