You will be seeing fairly big mpg gains by slowing down 10 mph.
Combined with some safe distance drafting I think you are going to be setting your new mpg record on this tank, Commuting 5 days a week it really makes sense to leave a few minutes earlier and drive slower as in the long run you will be making less pollution and bringing home more pay for your bank account and less to go on your fuel bill. Good move Fat Charlie
speed kills (your mileage)
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Save gas
Ride a Mtn bike for errands exercise entertainment and outright fun
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