Finally got a new tow rig! (any other 8.1 owners out there?)
#11
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Anyone Ive ever talked to pretty much says the same thing 10mpg no matter what , my experience is the same except for towing (6mpg) how you ^^^ get 16-18mpg is beyond me.
Blackbear performance tuned my truck, AFR`s are 13.5 cruise, 13.1 acceleration. Ive had long discussions (btw, you`ll never get him on the phone communication is email only)he keeps blaming parts. Ive replaced a few , (MAF, both 0`2s) now he sais its the coolant sensor or its burning oil. (doesn`t use any oil).
Damn Ive just reminded myself how much I can`t stand this truck, I gotta stop thinking about it or I`ll be on the web searching for a Diesel again.
Good luck with yours thou , as long as you don`t have an 80`s heavy resin bucket it should tow just fine
Blackbear performance tuned my truck, AFR`s are 13.5 cruise, 13.1 acceleration. Ive had long discussions (btw, you`ll never get him on the phone communication is email only)he keeps blaming parts. Ive replaced a few , (MAF, both 0`2s) now he sais its the coolant sensor or its burning oil. (doesn`t use any oil).
Damn Ive just reminded myself how much I can`t stand this truck, I gotta stop thinking about it or I`ll be on the web searching for a Diesel again.
Good luck with yours thou , as long as you don`t have an 80`s heavy resin bucket it should tow just fine
Im just saying, much better than stock mileage is possible, but I only pay attention on long trips because this is usually only time I ever fill the 40 gallon tank.
I did have a Quadzilla programmer in the truck before my HP tuners, but I had no mileage gain from that since it raised all my shift points and had full fuel enrichment settings. Also the shift points were so close to the rev limiter, it would bounce off the rev limiter instead of shifting at WOT. Pain in azz.
Last edited by Gimme Fuel; 10-06-2014 at 09:44 AM.
#12
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Yea, in stock form, they sucked! didn't even feel like it had any more power than a 5.3 half ton when I bought mine.
#13
GM may have not made the burbans in a d-max.....but its an easy swap from all i have read up on it. I was seriously looking for a 2500 burban before i came across my 2010 avalanche and the price was something i couldn't pass up.......but the 2500 burban with the 6.0 or 8.1 will take the d-max engine...its "mostly" plug and play.....depending on the truck you need to swap over the 4WD switch assembly, the power adjust pedals if the truck has them.....the diesel dash cluster (adding one extra wire back there) and some mods to the fuel pump. The Body will need a progressive body lift starting with a 2" spacer and gradually going to 0" at the back. If you search the forums online for "frankenburb" you will find a forum discussing the whole thing.
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-Wally
Money can't buy happiness, but it can buy horsepower. And I've never seen a sad person hauling a$$!
-Wally
Money can't buy happiness, but it can buy horsepower. And I've never seen a sad person hauling a$$!
#14
I put over 100K miles on an 01 CC Long bed w 8.1
10 MPG Period- one QT oil every 1200 Miles Period.
I check mileage almost religiously at fill ups- Put in 24 Gal - I went almost 240 miles Towing about 8 mpg
Now in the business fleet I have an 02 3500 Van- same motor- Same mileage- same oil usage
VERY strong motors!!
10 MPG Period- one QT oil every 1200 Miles Period.
I check mileage almost religiously at fill ups- Put in 24 Gal - I went almost 240 miles Towing about 8 mpg
Now in the business fleet I have an 02 3500 Van- same motor- Same mileage- same oil usage
VERY strong motors!!
#15
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I have a 04 dually. I towed my straight bottom top gun and now my TS Playboy Cig. The truck tows great, it has 95k on it. I pretty much only use it for towing. It gets 7-8 towing. It gets 10-11 everyday driving. The Allison transmission makes this a great truck. Uses the typical quart of oil every 1500 miles while towing.
#16
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Join Date: Mar 2013
Location: Connecticut
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My older truck is a gas job 2500. Its a great truck that works hard and gets the job done but i get there quicker and with less fuel with my Duramax. I have no problem yanking my boat around with either one though.
#17
Had an 02 dually. Loved the 8.1 and Allison but whenever you wanted to go somewhere your first stop was for gas. As previously stated 10 mpg. empty or loaded. Best was 300 miles on 32 gals. at or below speed limits towing a 26' velocity. Most performance mods just make you mash your foot down cuz it's fun so increased mpg. goes out the tailpipe.
#18
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Love the 8.1 2500 suburbans! I'm in my second one now, it's an '06. I had an '02 w/4.10 gears it towed a little better and would probably out run the one I have now, it has 3.73's. I get about 1-2mpg better with the '06. I bought this '06 with 22,000 it now has 117,000 on it been great to me. The dash says 10.4mpg avg. for the life of vehicle. I have figured it myself several times,11-12 on the hwy., around town driving kills the mileage. Every big block I have ever owned in a truck has gotten 10mpg, loaded or not, driving like a grandpa or like a stole it, doesn't matter, 10mpg give or take that's what you get. They are the best gas motor out there for towing.
Mine is stock. The info on the tune and mods is great. Ive been thinking about doing some things to it now that it's out of warranty.
Mine is stock. The info on the tune and mods is great. Ive been thinking about doing some things to it now that it's out of warranty.
#19
I have 02 chevy crew dually 8.1, 5 speed Allison,4.10 gears..... Internet mileage is sometimes suspect .Yesterday I drove 130 miles to pick up a small boat (26' searay).Going there I went on some two lane rds and roughly half expressway .I usually drive as fast as reasonable to get somewhere. But I will run less than ten mph over posted speed limit, on cruise .So I was going 64 - 78 mph.Truck got over 11 mpg .Coming back with that little boat on cruise ,I stayed on interstate only (no two lane) running about 76-78. I got 6.8 mpg.Truck runs great .That is real world mileage, running with traffic...not holding back traffic