Re: 42% Increase in MPG...
55mph = 17.5mpg
75mph = 12.5mpg
55mph = 1hr to go 55 miles
75mph = ~44min to go 55 miles
55 miles @ 17.5mpg = 3.1 gallons
55 miles @ 12.5mpg = 4.4 gallons
1.3 gallons = ~$4 @ $3.09/gallon
It costs ~$4 more to arrive at your destination ~16 minutes earlier. Time is money, is your time really worth less than $16/hr? Mines not, that's why I drive 90mph.
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