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Old July 10th, 2010, 01:25 PM   #1
RADRICK
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Default Duramax owners

I am kicking around the idea of selling my 2008 gmc 2500 w/ 6.0, to buy a 2500 d-max. I am wondering what kind of fuel milage you get when pulling your off road toy with a open deck car hualer, and what mileage you get empty? I want to know if I can justify the extra money for the payments, for fuel mileage savings. I know the power of a diesel would be nice, but I dont pull anything that big where I need a diesel yet. Just as a starting point I get approx 10 mpg pulling my cj on a 18ft open deck car hauler, approx 15-16mpg on the highway empty. When pulling an enclosed 4 place sled trailer I get 9 mpg, my bud with a 2008 gmc d-max gets 11mpg pulling the same trailer. And yes I do have a programmer, and K&N intake kit.
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Old July 10th, 2010, 02:30 PM   #2
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2004.5 14.5 avg towing 6k lbs, as good as 16.5 and as bad as 12.5
unloaded, 16.5 average, as high as 19 and as low as 14.5.

In the colder than 50 degree months subtract 2-3 mpg across the board.

I dont think the newest models get that kind of mileage anymore unless you remove a lot of the systems but that makes them illegal from an emissions standpoint. If you're going to sell your 08 to get a diesel, look for an 06 model, that is the peak of the duramax's. If you have the 6.0L and a 6L90 then I'd just keep it... it'll do all you need to but you arent going to get the mileage... nor the 5-10k premium for the diesel.
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Old July 10th, 2010, 06:52 PM   #3
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'07 LBZ

was pulling 18' closed deck with 5500# rig on it. typically 13mpg usually towing about 75mph with AC on. that's with 33s

now pulling 32' GN with camper and same rig on it. weighs about 12K. got 10.5mpg going to SL and back (from south of Chicago) towing around 75mph with the AC on. again with 33s.

IMO, it's well worth the extra $ to buy one. I go somewhere outside of Illinois atleast once a year for a big wheelin trip and pulling through the mountains is priceless with the d-max.

my .02
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Old July 12th, 2010, 10:54 AM   #4
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Just went north last weekend (Jackson to Cheboygan) with an enclosed v-nose 16x7 trailer and two quads in it, probably 5000# or so. 12 MPG driving very aggressively 77-85 MPH. On the way home, 70-75 MPH calm driving, 15 MPG. 06 LBZ PPE #3 tune 32" tires, pretty much stock otherwise.

With my trail rig and trailer, I've seen from 10 to 14, depending on wind, speed, driving habits, etc. I use either #2 or #3 tune. #3 gets up to 1200 degree EGT on the big hills, so I have to back out of it some.

Empty at 75 MPG, I get 20 repeatably if there is no wind. Wind drops it below 18 fast. Down at 60 MPH, I'll get 22-24 consistently, and have seen as high as 26.5.



Don't think that "fuel savings" is even worth talking about when comparing diesel to gas. You'll never save a dime, especially when you add in the $50 fuel filters and $100 oil changes, and of course the huge extra purchase price just to get a diesel. For anybody towing under 10,000#, buy a diesel is you WANT one, not because you need one. The only people that really need them towing under 10,000# are the guys that tow often in the mountains. The late model 1/2 and 3/4 ton trucks with gas engines are very capable tow rigs. The diesels just do it so much more effortlessly and are a lot more fun to play with.

That being said, I'll have a hard time driving a gas engine truck after owning my Dmax. I absolutely love it.

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Old July 13th, 2010, 06:51 AM   #5
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15mpg all the time highway and city mixed highway 80+mph.
11-12 pulling 11000 lbs. summer
11 pulling 4 place enclosed snowmobile trailer Winter 75-80mph
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Old July 14th, 2010, 04:34 PM   #6
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Thanks for the replys guys, I appreciate the info!
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Old July 22nd, 2010, 01:57 PM   #7
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like said above, by the time you factor in the extra cost of the oil changes, fuel filters, and higher price of diesel its going to cost about the same per mile as your truck before you even think of the cost of just having the diesel option. you could mod the d-max to get a couple extra mpg to help the case, but how long will it take to get your money back from that? It would be sweet to have all that torque and i would love to have one also, but it don't make any sense $$$$ wise unless you tow heavy and want to keep it until it until it quits after a few 100k miles.
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Old July 22nd, 2010, 02:29 PM   #8
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i like this thread i am gonna buy a duramax and put a lift on it next year i wanted to know what to buy and what to look for, sorry for thread hijacking
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Old July 22nd, 2010, 03:08 PM   #9
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05 LLY. I pulled an open trailer with a Camaro on it and always averaged 14.5mpg. 70 mph.

Averaged as high as 21 mpg once from Mackinaw city to cass mi in southern MI.

Normaly 70-75 mph highway cruising was 17-18mpg.

That was all completely stock.

Mileage got worse when I cranked the torsion bars and put 285's on it. Dropped about 1mpg.

If you run a programmer avoid Bully Dog IMO. I got tons of timing rattle and the thing smoked like hell. And it didn't de-fuel so the tranny went into limp mode a few times.
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Old July 23rd, 2010, 09:16 PM   #10
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I sold my '03 2500 GMC with a 6.0 and bought a new D-max with a LLy. I was getting smoked trying to keep up with all the other D-max's and Powerstrokes my friends have pulling 24ft enclosed snowmobile trailer.
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Old July 23rd, 2010, 09:34 PM   #11
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Quote:
Originally Posted by nickb304 View Post
like said above, by the time you factor in the extra cost of the oil changes, fuel filters, and higher price of diesel its going to cost about the same per mile as your truck before you even think of the cost of just having the diesel option. you could mod the d-max to get a couple extra mpg to help the case, but how long will it take to get your money back from that? It would be sweet to have all that torque and i would love to have one also, but it don't make any sense $$$$ wise unless you tow heavy and want to keep it until it until it quits after a few 100k miles.

unless you own a diesel you dont know what it cost to do the normal maintenance. diesel go twice or triple the distance before an oil change is need.

2004.5 duramax lly
i was pullin anywhere from 18-25mpg empty

loaded with a 30foot gooseneck and my tj i would get around 12-15 on a good day
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Old July 23rd, 2010, 10:10 PM   #12
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Just got my first Duramax about 3 weeks ago, 2009 3500HD ( not a dullie and it was still on the dealers lot ).

I'm new to diesel's but I love it ! Pulled my 27ft 12,000 lb camper upnorth twice and it is amazing. I'm getting 18-19 on the highway going to work and I got 14-15 pulling the camper between 65 and 70.

Had a 2003 1500 HD with a 6.0 and got 13 going to work and 7-8 pulling the camper, I loved my 03 but this Duramax is Bad Ass.
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