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Old 07-09-2016, 04:25 PM   #21
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The tow/trailer mode allows the transmission to stay in a lower gear longer as you accelerate and gain speed. It will shift somewhat harsher than normal, but doesn't seem to hurt anything. Also, you don't get maximum horse power for the 6.0 gasser until around 4,000 to 4,300 RPM, which sounds like it's about ready to fly. We love our 2500 HD, but realize it won't pass many gas stations, but it gets you there and in complete comfort. Enjoy it!
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Old 07-09-2016, 07:30 PM   #22
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Just to re emphasize something mentioned early, don't use cruise control. Use it only on flat level roads. Sometimes it is best to let your speed drop a bit on hills to maintain effective RPM. A cruise control may at times fully accelerate in an attempt to maintain speed.
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Old 07-09-2016, 09:43 PM   #23
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The tow/trailer mode allows the transmission to stay in a lower gear longer as you accelerate and gain speed. It will shift somewhat harsher than normal, but doesn't seem to hurt anything. Also, you don't get maximum horse power for the 6.0 gasser until around 4,000 to 4,300 RPM, which sounds like it's about ready to fly. We love our 2500 HD, but realize it won't pass many gas stations, but it gets you there and in complete comfort. Enjoy it!


What kind of gas do you get in that 2500HD when you tow?


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Old 07-09-2016, 10:16 PM   #24
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mrpep: On my 2009 Silverado (5.3L) I would run my cruise control. When approaching a hill at say, 65 mph, I'd bump it up a couple mph, say 67 mph, then as I start up the hill, I'd drop it back to 65 mph. If it started slowing to about where I started (65 mph), I'd drop the cruise down a couple more mph, say 63 mph. With a little practice, and not monster hills, you CAN keep it from downshifting.

Haven't towed with my 2500 HD 6.0L yet.
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Old 07-10-2016, 06:01 PM   #25
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What kind of gas do you get in that 2500HD when you tow?


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We get around 9-11 MPG towing on flat to rolling interstates of Illinois, Missouri and Kentucky, but less (7-9) when pulling in the Ozarks or Smokies when heading to Florida.
Our trailer weighs out around 6,000 pounds and we keep the speed down to around 65 with 4.10 gears.
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Old 07-10-2016, 07:26 PM   #26
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We get around 9-11 MPG towing on flat to rolling interstates of Illinois, Missouri and Kentucky, but less (7-9) when pulling in the Ozarks or Smokies when heading to Florida.
Our trailer weighs out around 6,000 pounds and we keep the speed down to around 65 with 4.10 gears.


Interesting, I wonder how I got so few mph ? The 2500 has a larger engine too , doesn't it? And you have the 4.10 which is suppose to use more gas.


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Old 07-10-2016, 09:58 PM   #27
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Interesting, I wonder how I got so few mph ? The 2500 has a larger engine too , doesn't it? And you have the 4.10 which is suppose to use more gas.


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Drag has as much to do with mpg as weight or anything else. Everybody's setup is just a little different, and we all drive a little different, so it's very difficult to really compare anything.
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Old 07-10-2016, 10:15 PM   #28
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2009 chevy 2500hd 6.0 3.73 rear 6 speed tranny. I tow in 5th gear in tow-haul mode and only use cruise on flats. 7.5 to 10 mpg towing and 15 mpg other.
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Old 07-10-2016, 10:23 PM   #29
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Drag has as much to do with mpg as weight or anything else. Everybody's setup is just a little different, and we all drive a little different, so it's very difficult to really compare anything.
Agree totally. He has to find out what's best for his style of driving and accept what he's got. We made the change from 1/2 ton to 3/4 ton at the expense of MPG, but we're happy with that knowing we can trade for something bigger later on.
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Old 07-10-2016, 10:24 PM   #30
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Ok, no I don't feel so bad - I guess towing is the main cause for gas usage


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