Based on my calcs assuming your full range would have been 340 miles, your fuel economy would have been 24.3 miles per gallon or 29 miles per imperial gallon which is nothing out of the ordinary.
The key to maximizing fuel economy is short shifting and no WOT runs which takes away most of the driving enjoyment.
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1991 E30 M3/Brilliantrot
2017 F80 M3/AW
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