Quote:
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Originally Posted by CGameProgrammer
Right. According to your figures, going from 60 to 70 results in a 14 mpg drop, and going from 70 to 80 results in a 9 mpg drop. The FE decrease becomes less severe each time your speed goes up.
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Yes, but it's a bit of an optical illusion because the MPG drop between 70 and 80 is from a much lower starting point. I think looking at the inverse measure - Gallons per 100 miles - will illustrate my point. The numbers I gave translate to -
1.92 Gallons per 100 mi @ 60
MPH.
2.63 Gallons per 100 mi @ 70
MPH.
3.45 Gallons per 100 mi @ 80
MPH.
So from 60 to 70 you use another 0.71 gallons per 100 miles.
from 70 to 80 you use another 0.82 gallons per 100 miles.
(from 60 to 80 your fuel consumption almost doubles)