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Old 11-04-2012, 10:21 AM
Penguin Penguin is offline
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Location: Illinois
Join Date: Aug 2003
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Mein Auto: Z4 and X5 Diesel
Originally Posted by tgb1974 View Post
I am about 1/2 through my first tank on a new 2012 X5d and, after about 90% true city driving (Chicago), the trip computer is showing about 15.7 mpg. I am not hitting it hard or anything, just a ton of stop-and-go traffic (and yes, I reset the trip computer before I left the dealership). Is this normal or does it get better over time? I am most interested to hear from X5d owners who do mostly city driving. Thanks in advance!
Seeing you are in Chicago, you probably are now getting "Winter" diesel fuel, which I have found drops my MPG a bit. Winter diesel has a lower energy content due to blending-in "lighter" fuel to ensure it doesn't gell or cloud-up in Winter temperatures.

I've also noticed that my diesel get really bad MPG until it warms-up to operating temperature. So if you city driving also includes short trips, you will take a big hit in MPG in cold weather.
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