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I want to throw in the numbers from my 3rd tank of gas (all US measurements).
I filled up after driving 460.4 miles on a single tank.
The car reported 31.6 mpg.
I put in 14.484 gallons, for a calculated 31.79 mpg.
If I had put in only .085 gallons more, the calculated mpg would have been 31.60.
That's close enough for me to say that the car's reported mpg is precisely accurate.
After refueling this morning, I continued to drive for 42 miles in Comfort Mode. Long commute, mostly highway. The car's reported conservation was 40.4 mpg at an average speed of 60.0 mph.
Obviously, playing around with the car when I'm not driving to/from work, plus the times the commute involves stop-and-go traffic, makes the average mpg for an entire tank less than 40 mpg, but still it's a heartening fuel economy.
2013 328i Sport Line.
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