Using iDrive with my 35d I can get in the low 30s on the hiway and I haven't reset it for about a month now and we average about 25.4mpg with a mix of hiway/city driving. On the other hand my X5M averages around 18-20mpg
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X5M Eisenmann exhaust, de-Catted down pipes, 22" HRE wheels, ECUProgram stage II (700hp) tune
X5 35d Tuned and Lowered
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