Quote:
Originally Posted by Egrunt
My F90 M5 is averaging 24 on the highway here in SoCal and she is a heavy gal at around 4,300 pounds. I know that most people who buy M vehicles are not worried about gas mileage, I know I was not when I transitioned from my F80 M3 to my current M5. Around town I stay around 17 miles to the gallon and on the freeway the best I have done is 26 on a long trip. With a mixture of driving 22 mpg is the average. One would think the X3M would do better but maybe its the aerodynamics of the vehicle. ...
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Expecting our X3M Comp without panoramic roof to weigh in less than 4500lbs, so your F90 still has about 150-200lbs less weight in city traffic for acceleration where it matters most. On Hwy no doubt the aerodynamics of your M5 should allow improved efficiency over our X3M, everything else including driving style being the same. Back in 2014 I looked at HP required for different constant speeds on the Hwy, where aerodynamics take precedence and weight plays less of a role, and this is where you would shine, esp at speeds 90mph and up. Take 90mph as an example - the 550i needed about 50HP to maintain speed
in this simulation, whereas the X3 35i needed about 70HP. At 110mph, the 550i needs abt 84HP, the X3 - 118HP.
What I don't know, does a 6cylinder 500HP engine producing 118HP use the same amount of gas as a 300HP 6 cylinder?