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God I need to do some maintenance on mine, can't crack 9mpg with my lq4. Looks like 55 degrees Friday, maybe Ill take a half day and do plugs, wires and fuel filter. Wires look like originals with 90k on them.
I have a 6.0 in my truck. It gets around 13 combined and towing it gets like 10 with my open trailer and my mustang on it. Ive pulled a 25 foot inclosed trailer a few times and it was fine around tow but when you get up to 60-70 mph its horrible. The truck has a hard time. And this is coming from a guy that go rid of a diesel for this truck. If you plan on only pulling a open trailer you will be fine, I cant even feel it back there when I pull it. Also, if you go the LSA or LS9 blower option Id imagine you would have horrible IAT issues and will probably hurt that motor pulling long distances. Just my two cents.
It's the gearing. My parents 2003 Yukon 2500 with LQ4/80E and 4.10's gets about 10. Sometimes 9, sometimes 11, but its always right around there. It's the nature of the beat with them. Unless you have a 3.23 and do a lot of highway, I can't see one getting into the mid teens regularly. Pure highway, I can get about 13 out of it if I stay around 60, anything more than that it's turning too high of an RPM to have any sort of decent economy.
It varys a lot for me. But I would say that I tow 10k maybe twice a week on average. Usually less than 30 miles each. Keep in mind that I am pulling through hills on just about every one of these trips.
I may not be pulling 10k all the time, but it's typically an 18+ foot enclosed trailer, which IMO pulls harder than a 10k lb car trailer.
There are also times when I'm hooking up to 15k or more. Otherwise, I would really consider another half ton.
Mine has 3.73s and its no highway, just too and from work and it barely gets up to operating temps. lol
Yeah just get a diesel in that case. If I towed like that I wouldnt think twice. Id go for a 2006.5 gmc 2500hd filthymax, but thats just me. Headstudded f-250 6.0L can be had for cheaper.