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It is possible BMW was able to squeeze more mileage out of this M5 engine since it is newer than the 550i V8.
With the government mandated improved CAFE ratings starting in 2011, BMW needed to improve the combined MPG rating of this new car.
My guess is they were only able to eek out a small improvement in city driving, whereas the big easy gains come from highway, so bam! Easy 24 combined MPG.
Last edited by dingolfing; 08-24-2011 at 11:36 PM..
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