Quote:
Originally Posted by autodahn
Well, all I can say is I just drove my xDrive50i home from Spartanburg and got an indicated 20.8 mpg on the highway! I haven't done much city driving yet, so I will keep you posted. BTW, my dealer's service rep says the computer is "pretty accurate" even though BMWs overestimate speed up to 100 mph, then underestimate 100+ (so that 100 mph is dead on). Can anybody else verify this? Cheers! Ad
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BMWs have always had optimistic speedometers, although being accurate at 100 MPH is new to me. Their consumption figures are usually pretty accurate as they measure fuel usage from the amounts that get injected -- obviously the computer knows that number very precisely -- and their odometers are generally much more accurate than their speedometers.
'Chipping' the turbo'd engines will make the computer MPG readings inaccurate as the ECU is fooled into injecting more fuel than it thinks it is doing. So you will get optimistic MPG readings if you go that route.