I can say with near certainty that other m5 owners like myself are not tracking our fuel economy because we are concern about the cost of fuel. I track mine because Im a competitive person and I like knowing the numbers.
Currently I just use the cars tracking system but I've considered using fuelly.
http://www.fuelly.com/
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2015 M5 - Alpine White
*Retired 2013 M5 - Black Sapphire*
Meisterschaft Exhaust
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