(Klaus?) After an "updated programming", some 03s and 04s get 13.5MPG?

[dochummer]

I actually ended up at Kachina hummer in Phoenix AZ over christmas, and asked them to check for any computer/pcm updates. They did, and said there was nothing to update (as far as the service sheet showed...but I know they fixed the airsuspension). Later, someone posted this link:

http://calid.gm.com/vci/VINEntryPre.do

just enter your vin number, and it'll tell you what updates you've received for your vehicle. Mine matched everything listed above by Paragon. I'd check before approaching the dealer...just may save you some time...