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6 0 gas mileage
My 03 Durmax just got 19 mpg pulling my 16 foot tandam with 2000lbs of concrete cylinders to my property this weekend. The same trip last year,Same load pulled with my 5.7litre yeilded 11 mpg and I had to run it to death to pull the hills. 19 mpg was done by keeping it under 70 mph, any speed over that and it does tend to go down a bit.
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6 0 gas mileage
I have a Dodge 3500 with the Cummins and the 4.50 rear end. I am in the 18-19 range all the time. At highway speed the engine turns a little high with the low rear end. I actually do better around town.
I have talked with a number of people with the same rig plus 4x4 and the higher rear end they were in the 22-24 range highway.
You used more oil at changes but with the large capacity the cycle is a little longer. The oil filter is 14$ and the gas filter is 50$. The drive train has a 100K waranty. Cummins engineers state there is nothing for the engines to do 500K . I have talked with a number with these type of miles and no repairs.
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6 0 gas mileage
I doubt if anyone questions the fact that diesel engines will get better milage than gasoline engines. I can say that with confidence on pretty much every brand. They also do better with towing. But, the question that started the thread was how the 6.0 gas engine does. There have been over a dozen threads devoted to various brand diesel trucks.
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6 0 gas mileage
The 6.0 has proven itself to be a decent motor. Nothing to go overboard on, but good. The 5.3 and 4.8 V-8's get MUCH better milage, but you are limited to th e 1/2 ton chassis (to me not enough). I think if Chevy would put the 5.3 in the HD chassis they would sell thousands of them to folks who do the occasional HD work but still need milage on a non-diesel up front buget.
For my money the Diesel option ($4000 in 94 when I bought mine) was worth it. 150k and no mechanical work done other than a bad rear main which ruined the clutch disc at 140k. BTW I average +/-17mpg running 75mph empty.
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6 0 gas mileage
I have a 2003 GMC 2500HD extended cab 4X4 shortbed with 4.56 gearing. I average about 14 mpg general driving and about 12-13 towing my dump trailer or my travel trailer. Overall, it's been trouble free and I've been happy. I traded a 2001 GMC 1500 extended cab 4X4 with the 5.3 for it. That truck averaged 17-18 miles per gallon, but only about 11 towing the same equipment. There are trade-offs with everything!
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6 0 gas mileage
I have an '03 2500HD Crew, but it's a 2x4. On piece of advice. I got one of those bug deflectors and my city milage rose from about 10 to about 12. Don't know if anyone else has seen similar results, but there's my 2¢.
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6 0 gas mileage
I know this is an old post, but just found the discussion. I have an 04' silverado 6.0 2500hd extended cab w/260?k miles on it. I pull trlr. w/things from building supply stores or boat/trlr.. I have found that keeping it around 65-70 i get around 17.5-18 mpg. and it needs new plugs. I think keeping my foot out of it so much in the hills we have here and don't use cruise much, better fuel milage. I do need to have the stepper mtr. for oil pressure gauge replaced, i just watch temp. and check oil every time i drive it.
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Gas Generator Weather Protecti
02-16-2004, 16:36 
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