E46Fanatics - View Single Post - **3.91 Diff Swap: Everything you need to know!!!**
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Old 10-12-2008, 07:17 PM   #191
Banned User
Join Date: Jan 2004
Location: Gainesville, FL
Posts: 25,616
My Ride: E46 330 and E30 325
Originally Posted by vminev View Post
How much did your gas millage dropped after the diff. install?? I use my 325ci as a commuter and I would love faster pick up but I dont wanna sacrifice my mpg too much....
Haven't really noticed that much of a difference at all. I do mostly city driving, and my cruising RPM at 45 mph went up probably like 400 RPM.
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