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      05-28-2014, 11:12 AM   #297
Brosef
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Drives: F90 M5
Join Date: Aug 2009
Location: Chicago

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Quote:
Originally Posted by Brosef View Post
I've noticed a number of you guys are confusing mileage with consumption. as someone pointed out already on this forum, a decrease in consumption is worth more than just the same percentage increase in mileage. here's the quick math:

e90 M3 (highway, then city):

20 miles / 1 gallon = 20 mpg
14 miles / 1 gallon = 14 mpg

if consumption decreases by 25%, that means that to go those same distances, you need 25% less fuel. so, in both instances, you only need 0.75 gallons. let's rerun the math

20 miles / .75 gallons = 26.7 mpg
14 miles / .75 gallons = 18.7 mpg
the 17 city figure definitely seems low relative to BMW's claim that the new car is 25% more efficient. but it looks like the highway number is quite close. see my previous calculations above.
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