I run old school Ď86 Suburban with a modified GAS 383cid carbureted engine. No Overdrive (3-speed) and 3:73 gears. Empty I average 13 mpg highway and towing the TT (33 ft Toy hauler and big front wind hog and over 10,000 lbs) I get 4.5 mpg. Itís hard to pull over 65mph w/o more gears. You all should be very happy with 8 plus mpg towing, EFI, Overdrive transmissions and tow modes. If I towed more, I would upgrade to a late model diesel truck, but the cost of the newer truck isnít worth it at my low tow miles.
COLOR="DarkOrange"]1990 Suburban K20/30 - Building truck to be stronger.
2006 Sierra Sport Toy Hauler
Haulin the Harley around w/me[/COLOR]