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F30 / F31 / F32 / F33 / F34 / F36 (2012 - current)
The sixth generation BMW 3 Series Sedan F30/F31/F34 and the first first generation 4 Series Coupe F32/F33/F36. Get the latest 3 and 4 series pricing from our ordering and pricing guide sticky thread.

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Old 05-24-2019, 06:23 PM
DCWhybrew DCWhybrew is offline
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Fuel Economy

Just drove from Memphis to Nashville. Averaging 35.5 mpg for 191 miles at 81.5 mph average. :double thumbs up: :-)


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  #2  
Old 05-25-2019, 09:48 AM
Autoputzer Autoputzer is offline
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You likely had a tail wind, which is a big factor at higher speeds. But, that's still good. I just did a 1000-miler in my Chevy Cobalt and only got 30.4 MPG.

Aerodynamic drag force is roughly proportional to the square of velocity. So, 80 MPH with a 10 MPH tail wind, your aerodynamic drag force is reduced by 23.4% (70^2/80^2=0.766). But, 80 MPH with a 10 MPH head wind increases the aerodynamic drag force by 26.6% (90^2/80^2=1.266).

I used to have a lot of work in south Texas. Texas is windy, usually coming from the west. Gong out there my MPG was low, and coming back it was high.
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