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I get consistently about 20.5 miles per gallon with my daily commute in sport plus 99% of the time.
On the highway for a long drive I had the car in Eco and was going about 75 to 80 and got about 23 miles per gallon. So for 20 gallon tank, 400 miles on a fill up is usual. I did a painful 2 hour test at 65 (painful because I don't like going at the speed limit LOL) and I got 25 mpg. Was driving by myself so only 1 ton of passengers for that ride.
I have the 20 inch rims. I have not had an issue yet. I had 19's on my RS6, 150k miles, never damaged a rim.
You have to move out of NJ or pave the roads yourself. You probably should get the 19 in rims since you'll need the extra side wall height which can make a flat less likely. Does the Waze app include pot hole postings?
Mike
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2018 M5 and 2019 Porsche Boxster GTS
Prior. '94 325is, '97 M3 Lux, '16 M2 |