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Old 07-08-2012, 06:49 PM   #1
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Towing mpg

I just recently made a trip to Ocean Lakes campground in Myrtle Beach,SC from Augusta Georgia pulling a 2011 Shamrock 21ss weighing about 5000 lbs fully loaded.My TV is a 2011 Chevy silverado crew cab 4wd with towing package and 5.3 l v8.This was my first trip pulling the camper over 3 hrs and I was very disappointed with the mpg I got on the trip.I got 9.4 there and 8.6 on the way back.I thought the truck would tow alot better than it did.It was constantly hitting close to 5000 rpm going up hills at 65 mph.I was wanting to know what others that have a similar truck and camper setup were getting.I am seriously looking at trading up to a chevy 2500 hd.If anyone could help with any suggestions I would appreciate it.
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Old 07-08-2012, 07:00 PM   #2
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Sorry, but a 2500 really will not pull and better, unless you go to the Duramax as well. I had a Puma 33 around 10K loaded and I got 8.5 to 9 with my 2500 gas (6.0?), so i traded it for a 2500 Duramax and I got 14 to 15mpg. Currently getting 12 with my 3500 Dually and a 14,000lbs 5th wheel
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Old 07-08-2012, 07:03 PM   #3
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dawg82, what final drive ratio do you have ??
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Old 07-08-2012, 07:11 PM   #4
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just finished a x-country trek from BC to NS in 5 1/2 days. (6000k). I averaged 8-10 mpg towing a 6500 lb loaded TT with a 2010 5.7L Tundra. Mountains, hills, flatlands, didn't make any difference to the mileage. If you climbed a hill, you would save on the way down. My speed varied from 90 km/hr to 120 km/hr and I didn't notice a big difference in gas mileage then as long as I got the truck in overdrive. There was a nice sweet spot around 105 km/hr though.
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Old 07-08-2012, 07:11 PM   #5
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I'm pulling around 7200+ lbs with my '10 2500 6.0L gasser and get around 9 with an average spd of 60-65. I didn't expect much more, and my rpm rarely sees 3500. The combo of the 4.10 diff, and 6 spd trans really make it pull well. Had I had an extra 8 grand I would have gotten a diesel.....but 8 grand will but alot of gas!
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Old 07-08-2012, 07:14 PM   #6
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i pull my 5000lbs. Roo 23SS with an '07 Avalanche with the 5.3 and 3.73 rear end. i rarely get that low of mpg average. usually after a trip, i get between 9 and 11 mpg. and i live in California with lots of hills and mountains.
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Old 07-08-2012, 07:19 PM   #7
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Quote:
Originally Posted by Rugged Brown View Post
I averaged 8-10 mpg towing a 6500 lb loaded TT with a 2010 5.7L Tundra.
Terry, what happened to your Dodge ??


Quote:
Originally Posted by EXGMTech View Post
I'm pulling around 7200+ lbs with my '10 2500 6.0L gasser and get around 9 with an average spd of 60-65. I didn't expect much more, and my rpm rarely sees 3500.
3500 rpms is about the maximum that my truck engine sees, and that is mostly getting up to speed on the interstates. If I am not doing interstate, on many trips my engine doesn't go much about 3000 rpms. A couple of times the tranny slipped down to 2nd on the highway, and the revs went up to about 4000, but that usually doesn't happen.

That is the reason I asked about what final drive the OP has.....a high final drive (low numerical) might be causing the tranny to shift to 2nd on the highway to keep up speed.
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Old 07-08-2012, 07:24 PM   #8
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mtnguy it has a 3:73 rear end.It would lose 10 to 15 mph going up hills and that was giving it a good bit of gas around 4500 to 5000 rpms
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Old 07-08-2012, 07:31 PM   #9
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Quote:
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mtnguy it has a 3:73 rear end.It would lose 10 to 15 mph going up hills and that was giving it a good bit of gas around 4500 to 5000 rpms
Hmmm, that should be a good final drive ratio, unless you have over sized tires.

I don't have an easy answer for you. I here the 5.3L is a good engine, and is comparable to my my 2006 5.4L Ford. I will let my truck loss a little speed up some of the steeper hills around here to save on gas, but losing 10 to 15 mph just doesn't seem right.
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Old 07-08-2012, 07:34 PM   #10
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I just looked up the stats on your truck. The 5.3L has more hp than my 5.4L, but not quite as much torque. But that 6 speed transmission should give you much more flexibility than my 4 speed. Other Chevy owners will have to chime in here to figure it out.
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