Quote:
Originally Posted by Lildude512
So I had a 2013 535i with 54k miles and it would do 25mpg then unfortunately it was totaled. Now my 2016 535i does 20 mpg with only 26k miles. Wonder what changed over the years because both of them do what they are rated for on the window sticker. Any ideas what bmw changed when both engines are n55
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I assume the specification/options are different, (like the wheels, as already mentioned).
Same base spec' F10 models, here in the UK, are rated as more economical in later builds. Options can be the difference.
One other factor, the higher mileage 535i may have had a very free running engine, due to the mileage, newer car not yet at peak. The reason for saying this, I had a new engine in an E39, at 65k miles. The new engine, dropped the economy by ~5mpg. Even 25k miles later the new engine had not reached the efficiency of the old engine, was getting there but still needed more miles.