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Old 06-06-2010, 09:09 AM   #1
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2002 chevy 2500hd 6.0 engine gas...4.10 rears Towing... almost a whopping 8 miles to the gallon ! about 11 just around town,,,,,,,is this normal? tune up and maintenance all up to date too !

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Old 06-06-2010, 09:38 AM   #2
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Sound about right with a gas engine, pulling more than 5k lbs in high profile weight.

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Old 06-06-2010, 10:23 AM   #3
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I had the same set up except for a 2001 and I routinely got 9.9-10.0. When slowing to 60, I would get 10.2 but I generally travel 65. It was a good truck but slowed too much on the hills.

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Old 06-06-2010, 10:42 AM   #4
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I have a 2008 2500 with the 6.0. I have upgraded the tires to 33in and reprogramed with the Hypertech to get the shift points right with the new tires.

Towing last weekend to the UP, I got 8.2-9.6. I believe the difference was in the gas. When I filled up at Shell (3 tanks) I got better mileage. This was at 70 on the interstate.

Empty, driving back and forth to work, I am getting between 14-15. It is all interstate at 75-80mph. 48 miles each way on a daily basis.

In town empty, I am getting between 10-12.

The hypertech programer has really helped my shifting.
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Old 06-06-2010, 11:03 AM   #5
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I been thinking about getting a programer for my truck for the fuel mileage.

With the duramax empty we see about 22 empthy on pretty flat ground. I can get as high as 13 pulling the trailer if I'm taking it easy. It did 9mpg coming back from Taladega but we were 80+ on the way back.
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Old 06-06-2010, 10:14 PM   #6
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10 mpg....8 towing ..........It's what I get with my 8.1.........I don't feel so bad anymore
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Old 06-06-2010, 11:17 PM   #7
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my 5.4 only does 9 towing and thats going55 I do feel bad!!
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Old 06-06-2010, 11:30 PM   #8
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jeffandaudrey,In 2001 I had a Chevy 2500 ext cab 4X4 6.0L(300hp)with 4.10 gears and we pulled a 8k TT with it at the time. I never saw more than about 8 mpg towing at speeds between 60 and 65 mph. Empty highway I got 14 to 15 mpg and empty around town 11 to 12 mpg so I would say you are pretty much right on for your truck. The newer gas trucks will get a bit better mileage than that but not enough to worry about.
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Old 06-06-2010, 11:53 PM   #9
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14 on the interstate, 11 around town, 8 pulling the camper.
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Old 06-07-2010, 09:20 AM   #10
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Thanks to all that replied,,,,what a relief to know my almost 8mpg is in the ball park ! (am i ok) next upgrade will be the tow vehicle I guess,,,diesel is the way to go from what I gather,,,thanks again to all that replied,,,this crossroads forum is ALLright !!!!!

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Old 06-07-2010, 09:42 AM   #11
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2008 Chevy 2500 4x4, ext. cab with 4.10 gearing - 8.5-9 when towing, 15.5-16 when empty around mostly rural Maine.
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Old 06-09-2010, 12:03 PM   #12
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2006 GMC 2500 6.0 w 4.10 gears and a Vortex exhaust system getting 11.6 mpg pulling my ZT31SB

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