Quote:
Originally Posted by ChinaBob
2017 F31, I bought it CPO with 23,xxx miles, now at 30,000. Onboard computer never reset as far as I know, showed about 38.5 mpg when I first got the car, now at 45.9 mpg. Almost all highway driving normally cruising at a little over 70 mph.
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Update: Now in the dead of winter with ~ 58,500 miles on the clock. Still a lot of highway driving with temps as low as single digits. I try to keep the cruise on 72 mph but that varies with traffic - usually actually faster in heavier traffic but that's for another discussion.
Overall average mpg down to 43.5 but I've never had under 40 on a fill. Filled just today for 41.7. Never use any kind of fuel additives and run Shell Diesel whenever possible. There's a noticeable 1-3 mpg and performance drop off with other brands available in the Northeast. I freely admit that that the performance difference may be in my head but the mpg difference is real.