Originally Posted by Speedwagon
All of a sudden my 328IX E91 is getting 22.7 mpg, was 14-18 mpg, and I didn't reset the computer. I'm still driving over 100mph on the autobahn and slow city driving. I have 4800 miles on my E91. The only thing that is different is, I put 18" wheels with DWS tires on about 500 miles ago. I can't believe that the new tires would help that much with the MPG! Can this be true?
I wouldnt have thought that kind of gain would be possible.