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Originally Posted by ElanC
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 miles per hour.
2.63 Gallons per 100 mi @ 70 miles per hour.
3.45 Gallons per 100 mi @ 80 miles per hour.
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)
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Yes, that's all true, but if you remember the way this conversation started, it was because NASA got a 7 mpg drop going from 60 to 70 but a 9 mpg drop going from 70 to 80, which I argued was a result of the cold or other factors because it should have resulted in less than a 7 mpg drop. You are agreeing with me.