I ended up having to drive some highway miles on this and had to cut it short. I did, however, get just under 200 miles of strictly city driving. Again, I have a 2008 4.8, so these are not 6 cylinder results. I averaged 23.2 mph with an average of of 17.8 mpg. I ended up driving in the downtown vicinity and noticed that the consistent stop and go was horrible on the mileage, and it was hard to manage the X5 trying to feather the gas and then slow down/ coast to the stoplights. It pissed off the other drivers too, so I had to moderate as best as I could. I am currently on another tank of gas and am seeing my city MPG be around 14-ish, but again, I can drive around South Bend for a while and not have so much stop and go. I think I will be seeing about a 4 MPG difference, but I will follow up. I will say that the thing i s way much more enjoyable to driv ewith your foot than the CC stalk.

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