I sent the fuel milage question to my son, he has a 2003 Excurson W/6.0.
He lived in Anchorage Alaska last year an we went camping in Sewart he pull's a 27' trailer we flew up the moutains at 60 to 65 mph and he got 12mpg and you didn't even know it was behind you. He now lives in Willamsburg Va. and works in Langley Va. which he says is a 45min commute here is his reply also remember this thing weighs in at over 7000lbs.

I haven't reset my computer in about 2 months now and it's sitting right at 16.4 - which is great considering it does take a long time to warm up - and this is ALL driving, not just highway. I've noticed it's considerably quieter now - just turned over 30K miles a couple weeks ago. No problems since they finally fixed the oil leak "right". Nova teases me that I should be ready to trade it in since I've now had it right at a year - I told her I could keep that thing forever - I love it - especially the motor and the space...