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Old 01-14-2015, 11:22 AM   #31
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2012 GMC Sierra 1500 (5.3L, 6 spd trans, 2WD, 3.42 rear end); I get about 15-16 average (mostly slow/city driving); around 20 on open highway if I can keep my speed down (which is difficult here in the wide open spaces of Texas); About 6-8 towing my 28BHBE (avg speed between 60 and 65) unless I have a tail wind, then I get a lot better, but that tail wind is a rare, almost mythological occurrence! LOL!

If I could keep my wife from having an embolism, I would tow everywhere at 45-50 mph and get more like 10-12 MPG...
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Old 01-14-2015, 01:19 PM   #32
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Not many of those made? Sounds like fun...

The Tahoe gets about 14mpg empty, 6-8 towing. My last TV (an 02 Yukon) had a smaller engine (The 4.8L) and got about 1mpg better than the Tahoe. All that being said, the Tahoe didn't pull our 242 as nice as the Yukon. Not sure if the Tahoe has steeper gears, but just doesn't seem to tow as nice
Only made from 02-06 and I don't think to many. I almost always have somebody question my tow rig at campsites before I explain its a 2500 with a big block..lol
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Old 01-15-2015, 04:40 PM   #33
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Mine is in the signature. Every big dip is towing. As others have said, wind is a huge factor. I don't baby it at all towing. 62-64 mph. If trailer tires were rated for higher speed, I would tow 66-69 mph since it seems to be the sweet spot in the power-band. All the speed limits around here are 70/80, and it would be nice to go a bit faster.
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Old 01-15-2015, 05:16 PM   #34
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Thumbs down MPG Honesty

I tow a 32BHDS TT (approx 9.5k on the road) with a 2008 Silverado Diesel.

Good day with little or no head wind @ 65 MPH 11 MPG Non Tow Mode.
Good Day with little or no head wind @ 65 MPH 9.5 to 10 MPG Tow Mode.

Empty or towing the major factors are head wind and speed. For every 5 MPH over 55 MPH expect to lose at least 1 MPG. The above figures are for more or less flat Interstate HWYs. Why would someone run 80 MPH with a Trailer attached?
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Old 01-15-2015, 05:24 PM   #35
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With the rig in my signature and driving between 60 mph and 65 mph, I run somewhere between 10 mpg and 12 mpg depending on wind and terrain.

This based on one season and around 2,500 miles.

Last trip of year was roughly 400 miles, roughly 11.5 mpg; no hills to speak of.

I understand that other HD diesel pickups with the DEF/SCR emissions system get around 1 mpg better. My truck has an earlier emissions system which is less efficient.
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Old 01-16-2015, 06:08 AM   #36
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Our truck is a '96 Chevy crew cab with a vortec 454. We get between 5.5 and 6 miles per gallon pulling our fifth wheel.

We've owned this truck free and clear for 15 years, and it has only liability insurance. It's a very economical solution to the 2000 miles we need to pull the camper every year.

With the collapse in gas prices, my cost to tow has been reduced from ~50 cents per mile to ~25 cents per mile. I hope the prices hold out for the upcoming season.
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Old 01-16-2015, 06:30 AM   #37
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Our truck is a '96 Chevy crew cab with a vortec 454. We get between 5.5 and 6 miles per gallon pulling our fifth wheel.

We've owned this truck free and clear for 15 years, and it has only liability insurance. It's a very economical solution to the 2000 miles we need to pull the camper every year.

With the collapse in gas prices, my cost to tow has been reduced from ~50 cents per mile to ~25 cents per mile. I hope the prices hold out for the upcoming season.
That's how I feel about our Avalanche. Its paid for and only has 30K on her. The big block will pull anything I own. And one look at the current truck prices makes me lover her even more !!
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Old 01-16-2015, 07:05 AM   #38
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2007 Ram 2500 5.9 CTD: 13-14mpg towing 5er, 21-22mpg highway
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Old 01-16-2015, 08:52 AM   #39
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9-10 MPG towing
18-19 MPG highway not towing
16'ish MPG average not towing
I would expect slightly higher numbers at lower elevations. All my driving is between 5,000' to 12,000' in elevation.
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Old 01-16-2015, 09:08 AM   #40
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I towed many different trailers many miles with the truck below. I calculated my mpg many times under many road and wind conditions. I hauled very few very large or very small trailers. I usually drove on highways at 60-62mph, loaded and unloaded. Driving much faster than that, mpg dropped significantly. All that said..

Hauling travel trailers: 10-11mpg
Hauling 5th wheels: 11-12mpg
Unloaded: 19-20mpg
With my 2003 F250 6.0, I see about the same. Roughly 21mph highway (with a cap on the bed) and 12.5 towing the 30.5 BHLT 5th.
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