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      03-10-2014, 08:51 AM   #73
PvsNP
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Drives: 2011 M3/2014 M5
Join Date: Mar 2014
Location: Manhattan

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Remember that in city where you have a lot of idling, there is only so much the turbos can do. Idling kills the mpg performance and auto start/stop only helps you so much.

When I say city driving, I mean a lot of stop/go red light traffic, not driving for 10 minutes at 40 mph without stopping, I mean like really city driving in London or Manhattan.