Well, coming home from the UP I used the manual or column shift and set up to 10 gears, without Tow Haul Mode, and it worked good. One 75 mile stretch I averaged 9.9 mpg with cruise set at 65. Still have to figure out what is wrong with truck but happy that manual shifting is an alternative instead of damaging the engine/transmission.
Update-was going to take truck for a scan today, but the check engine light went out, still will have it scanned to find out why,
Later-
Happy 250th, 4th of July-
We have a 2024 gmc 2500hd sle doublecab 6.6l gas 4x4, 3540 payload, towing a 2015 Rockwood 8329 TT, 35' with tractor supply box on back.
Dry weight is 7200, but the important number you need to always use is the 9000 GVWR.
It tows it just fine, that 6.6l gas engine is a work horse, Later-
Hey all, going up I-75 towing the Rockwood TT, 9000 gvwr, with our 2024 gmc 2500 6.6l gas at 65mpr.
Stopped at a rest area for a few, started back on the highway about a mile, the truck jerked, disengaged tow haul mode, and went from 2200 to around 3800, noticed the check engine light on, then the air conditioner was surging. Any Ideas what caused this?
Later-
Congratulations Isttype, on your gmc.
Really like my 2024 2500hd sle doublecab now with 85,500 miles. I checked the oil today at 4800 miles since last oil change and barely reading on the stick. I don't care if GM says it's Acceptable adding a quart every 2000 miles because that is 100% BS,
It is not a 1966 Harley Shovelhead! Sounds like it's setting up a future failure like I had with my 1500 6.2l.
Other than oil consumption problems, I really like the 6.6l gas and 10 speed is really nice. Towed a light 4000 pound trailer last week and averaged 14 mpg. I was pretty impressive that a 7300 pound gas truck did 14mpg towing,
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I've decided to pass on that 3500hd with No service records or No receipts of anything done, just seemed like a quick sale before something big mechanically happens.
Thank You all for your comments,
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Thank You newdude and davester,
my biggest hesitation is with that many miles something is bound to break, and could be very expensive. Good to hear real thoughts from experience,
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Hey Chuck, Happy Easter, the truck was started up for about a minute while I put on boots and jacket. I set the cruise between 58 to 60 depending on traffic, had a few stop lights, and it was about 50 degrees. Even though it was a short ride of 52 miles one way, it surprised me it did 20 mpg, Later-
Hey, did a 52 mile drive each way with a few hills, but mostly straight roads, then looked at a 20 MPG Surprise. On the way back home with several stop and go still had 16.2 mpg, not bad for the 6.6l gas with 10 speed.
Later-