Join Date: Dec 2009
Location: Out there, somewhere
First, we tow the exact same truck. An '11 GMC Sierra 1500 Extended Cab 4x4 which, on the scales, tips them right at 5300 with a full fuel tank. Then, we haul an '08 Honda GL 1800 Goldwing, very, very close to 900 lbs on a, Rampage lift which, I have not weighed but I suspect it's very close to 275 or so. So, all in all, we too are dragging right close to 6,500 lbs.
Our coach, is an '04 Itasca Horizon 36GD with an ACERT C-7 330HP CAT. If you get anything over 7.5 mpg, I commend you. I'm really, really lucky if mine EVER goes over that figure, towing or not. I'm no hot rodder, how can you be with 27,000 lbs. of coach and, 6,500 lbs. worth of toad?
When we purchased that coach, we lived in San Diego. We picked up the coach in Reno NV. We had no toad and, nothing was in any compartment, inside or outside the coach. I use cruise control about every inch I can so, the coach drove itself for almost 547 miles at, a whopping 62 mph. You know what I got? I got the tremendous mileage of, 7.5 mpg.
When the coach is fully loaded, fuel, water, tools, chairs, and a few thousand things more, both of us and, the queen, a little Schnauzer, and towing the truck with the Wing in it, I get SEVEN POINT FIVE MILES PER GALLON!! And, again, it's at the lightning speed of, 62 mph.
Now, speaking of your truck. I'm assuming it's the 5.3L engine. Again, ours too is the same engine. If I'm really, really lucky and, I keep it real close to 55, I might, JUST MIGHT squeak out of it, a whopping 18 mpg. It's never in it's life, got the mileage that the specs call for. And, yes, I keep the tire pressure up to par and all that. And, on trips back to San Diego from our present home here in Lake Havasu City AZ, that truck is normally driven at about 65-70. That speed range allows it to come in at the phenomenal mileage of about 13-14. And it's not carrying the Wing!!!!
2004 ITASCA HORIZON 36GD, 2011 GMC Sierra 1500 4x4 Toad '08 GL 1800 Gold Wing
Retired-29.5 yrs, SDFD, Ham - KI6OND
Me, Karla and the Sophie character, (mini Schnauzer)