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      02-14-2013, 09:08 AM   #5
maswastage
Resident Diesel Junkie
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Drives: 2010 AW 335d
Join Date: Aug 2009
Location: Maryland

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In my experience, driving 75 mph even in below freezing temperatures still nets 42+ mpg. Oddly enough, driving 65mph didn't seem to improve it by too much, maybe up to 44 or 45.