Quote:
Originally Posted by Brosef
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
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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.