Join Date: Dec 2013
Location: Winchester, UK
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Last week I managed more than 60mpg (UK gallons, 50mpg US) in my F56 MCS at around 50mph on cruise control for nearly fifty miles.
However as this was what the OBC reported, I decided to measure it's accuracy pump to pump to get a real feel for the car. Here's what I found:
Distance covered: 264 miles
OBC fuel consumption: 33.3mpg (lots of traffic)
What I put in the car: 36.65 litres (8.07 gallons in the UK)
Actual fuel consumption: 32.7mpg
That is pretty close....
The on board speedometer is accurate as well - over reading by between 0.7mph and 1.3mph at 60mph using a separate GPS device.