Wow! Some people here are stating to get better mileage than the 3-series. My X5 4.4 gets ~14 mpg/city.

A full tank here costs £11 or USD18.:popcorn:

Seems like around 5mpg for me, everytime I pass a gas station I have to stop to get gas.

Filled Gas today...
 

I filled the tank with Shell Vpower.The display started with 390 miles and reached 435 miles after 30 miles of highway driving.I used a gas treatment oil (the ones which will be sold at Advance Auto Parts) before this fillup.

Also,in my 3 months of ownership,you can never believe the display computer for calculating 'Miles on the Full tank'.It changes so dynamically.In my previous fillup,I got 370 miles for the full tank.I drive 30 miles to work one way .

Are there any items which will improve MPG ?

Yes, lower octane fuel.:thumbup:

I must be driving miss Daisy :-)

Using lower octane fuel and watch your motor shack back and forth, lighting in and outside the car it would dance :D

Eggshell touch on the gas pedal, no extra junk, (weight), in
the trunk, keep it below 70, or 60, avoid stop and go, etc.
All basic stuff; there is no gizmo or add-on gadget to get
more mpg out of a 2 1/2 ton brick, imo.
GL,mD

I have to say I've been really pleased with the mpg on my 4.8is. I keep the fuel consumption showing on my display, and I'm averaging 16+mpg with a combo of highway and back road driving. I tend to fill up when I get near 1/4 tank, after I've driven around 320 miles. That also confirms (20 gallonsX16mpg=320 miles) my gauge is accurate. Considering the HP and performance, the mpg is a bonus! One of the things I do to help conserve gas is to coast to traffic lights and stop signs if possible, instead of keeping on the gas and applying the brake hard. Of course it's not always possible to do this if you've got traffic on your butt:-)

I get about 320 miles per tank on 75% city driving with 4.4L.