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It looks like the city MPG is better, and the highway MPG is a little worse for the M5 compared to the 550i. With the auto start/stop, that makes sense.
I was just looking at the BMW UK site for the 550i:
18.2 urban / 37.7 extra-urban / 27.2 combined
So EPA 19 city / 24-25 highway / 21-22 combined sounds more realistic.
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