1. Try GS, and the manufacturer of your transmission, and CAT for your engine.
2. I have the Xantrex 458, works very well.
3. This seems about right, in hill country. I have the 400 Cummins, and get between 6.2 in the mountains of Idaho and Montana to 8.4 mpg in the flat lands of Kansas and Texas.
4. The alignment is probably out. I have had this happen as well. Went to a Freightliner shop and they aligned my coach for $110. Big help.
5. Maybe on the flat lands the economy button works. Mainly it expands the timing of upshifts and downshifts to keep the engine RPMs as low as possible, with the theory of obtaining more MPG. It works on the flat lands, but plays hell with the transmission on the hills.
Also, I recommend you put a Safe-T-Steer on the coach. Mine took away the sway, involuntary movement from lane to lane after a semi passed me, and stabilized the whole front end. You'll be glad you did.
07 TM 40D;ISL 450 Cummins(upgraded). Very happy w/coach
Gnarly toad to scoot around.
Geocaching, hiking, fishing, National Parks, Civil War sites.