I did an economy run today to see what MPG my car can achieve. Just over 100 miles (Devon to Wiltshire), cruising at 70 MPH (slight traffic delay around Bristol) and I averaged 60.3MPG.
Now I usually average about 45mpg in day to day driving but I normally cruise at 80/85. Of course the 45 mpg average includes ALL driving. Cruising at 80/85, I'd get 50 ish mpg but that doesn't include cold starts, town driving, A roads, etc, hence the overall 45 mpg average.
Going back to the original question though, I don't know why I care. I have a fuel card that includes private mileage so why do I still want to max out economy from time to time?
PS - Car is a 520d Touring Auto. Total average mpg is worked brim to brim, the 100 miles was from trip computer HOWEVER over the past 3,000 miles I have used the hidden menu to apply a correction factor to the computer mpg reading. The computer reading is now always +/- 0.5 mpg from true brim to brim calculations.
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