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2007 / 2008 GMC 2500HD Diesel

Old 10-08-2007, 09:46 AM
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Default 2007 / 2008 GMC 2500HD Diesel

I am in the market for a new truck and would like to hear from anyone who may have either a 2007 or 2008 GMC extended cab with the diesel motor.

I do alot of highway driving with some boat towing and I need a truck that will haul my set-up at about 12,500#.

GMC seems to have the best truck out there, but I'm concerned about the mileage on the highway, especially since diesel fuel is now about 35 cents more per gallon than gas in our area.

I drove both a gas and a diesel over the weekend and the diesel far out performed the gas in the power department.

Any thoughts from you truck guys ??????

Thanks.
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Old 10-08-2007, 09:31 PM
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Default Re: 2007 / 2008 GMC 2500HD Diesel

I've got an 06 Chevy D/Max w/Allison Tranny and love the truck. Ext cab, long bed, 3.73 gear which tows my rig, 19ft Carolina Skiff @2800rpms @ 70mph=14.5-15mpg. About the same around town driving. Without the boat but with a 600 lb 4 wheeler in the back again at 70 mph=19.5-21+mpg. All the time. Not sure you can get the 3.73 in a GMC. Most of the ones I looked at in 06 ALL came with 4.10 which with your load, might be better. Great trucks.
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Old 10-09-2007, 06:11 AM
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Default Re: 2007 / 2008 GMC 2500HD Diesel

Ron,

Thanks for the response. How is your mileage on the highway when you are not towing ?

Thanks,
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Old 10-09-2007, 11:37 AM
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Default Re: 2007 / 2008 GMC 2500HD Diesel

First a correction, it's 1800 rpm's, not 2800 for all the info in the first post. It's also a 4x4.
Normal hiway/interstate at 70 mph, I get from hi 19's to hi 21's. Have not broke 22 yet but I've got a friend who drives at 60, he's about 75 years old, and swears he brakes 22 all the time. Around town, 14 1/2 to 15. Most power and comfortable ride than I've ever had in a truck. For me, I can't really justify the D/Max however, I'd NOT go back to the gas engine. I had a new 06 Z71 with the flex fuel old/new 327, sickest thing I've ever tried to pull with and it might get 10mpg pulling the boat. Kept it 3 months and dumped the dam thing. With this, set the cruise and let her go. Hope this helps. Go for it!!
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Old 10-09-2007, 12:23 PM
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Default Re: 2007 / 2008 GMC 2500HD Diesel

Ron,

Thanks very much for the update. I'm pretty much sold on the GMC 2500 HD Sierra.

I had an o6 1500 Crew 4x4. Could only coax about 15.7 mpg, now have an o6 Yukon Denali with a big block and since the addition of the ethanol went from 15.3 mpg to 14.6 mpg. ( neither of these were used to tow the boat).

I did the math based on current fuel cost at the pump in my area and I project that I will save about $7.00 per twenty gallon tank of diesel over gas.

Now, if I can just get the cost of the truck down to something acceptable..........

Thanks again,

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Old 10-09-2007, 01:33 PM
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Default RE: 2007 / 2008 GMC 2500HD Diesel

I switched from a Gas F-150 to a Dodge 2500 CTD.

While not the same truck you asked about it might give you some insight into highway mileage.

Unloaded my 04' F-150 got 13 MPG on the interstate running 70-80mph.

Unloaded my 07 2500 CTD gets somewhere between 17-19 MPG running 70-80.

The key is to not run it to far over 2000rpms. If I keep it at 70 I'll see 19 MPG all day long.

Both MPG numbers are hand calculated, because the overhead is always off by a little. And both trucks are 4 x 4.

The Diesel number will continue to increase until the truck is fully broken in, which it's not.

The Chevys are nice trucks, but damn they are proud of them. The two reasons I went with Dodge over Chevy were price and I personally liked the Cummins better. I'm not trying to tell you the D-max isn't nice or one is better than the other, but if price is a problem take a look at the Dodges. I've been a Ford guy all my life, but I have no regrets buying the Dodge.

Good luck and let us know what you do.

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Old 10-09-2007, 03:02 PM
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Default Re: 2007 / 2008 GMC 2500HD Diesel

Very little difference in the GMC vs the Chevy, mostly the "badges". Only thing I ran into with the GMC was the gear ratio, it ONLY came with the 4.10 and I knew I didn't need that much gearing for my loads, you might?
Oh yes, they are proud of them. I ended up going with the LT Level 1 package, no leather, no onstar, no push button for the 4x4 and so far, I've not missed any of it. My truck listed out $41,860. Ended up a little less than $35k in it. Ouch, but I traded an 06 in. Kind of stupid but I was sick of the gas 06. Very happy now. Again, good luck. You won't be sorry.
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Old 10-13-2007, 02:56 PM
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Default Re: 2007 / 2008 GMC 2500HD Diesel

Update # 1 -

Drove a GMC 2500HD SLT pkg, extended cab, duromax today and except for the ride...... it seems to be a great truck. Very comfortable and lots of good amenities.

The salesperson was supposed to come up with a deal..... trade the 06 Yukon Denali for the 2008 HD.... was too busy !!!

Oh well, on to the next dealer.

I'll post as soon as I can make a deal ( feel alot like Monti Hall here - let's make a deal !!!! )

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Old 10-21-2007, 03:47 AM
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Default Re: 2007 / 2008 GMC 2500HD Diesel

Spent the last couple of weeks trying to hone in on the right truck for towing and driving back and forth to work everyday. Narrowed it down to the 2008 GMC extended cab diesel 2500 HD and the Ford Power Stroke F-350 super cab.

Went out shopping at my local dealers yesterday to try to close a deal.

Well, bottom line.... ended up trying to make a deal for a Ford F-250 crew cab power stroke, lariat pkg. Very nice truck and it seems to have every thing that we would need to fill the bill.

Negotiated for three hours and ended up 2 thousand apart !!!!! Had to walk away as they could not meet my budget.

Back to the drawing board..... oh by the way, GMC for the same crew cab truck with slt pkg was about $ 8K higher in price. Very nice truck, but not worth the extra cash.

Not sure how I'm going to bridge the gap on the difference in cost on the Ford...............

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Old 10-21-2007, 09:26 AM
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Default Re: 2007 / 2008 GMC 2500HD Diesel

I've got an '07 Silverado 2500 Duramax: regular bed, crew cab. In the city I'm getting between 13-14, rarely 15... depends how I drive. In the highway I'm doing between 16-17, without a load in the bed.

I'm a little disappointed in the fuel efficiency, or lack thereof. These new EPA Emission Standards didn't help the efficiency. Hopefully as the technology becomes more common and further developed, these new diesel engines will become more efficient.
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Old 10-21-2007, 03:51 PM
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Default Re: 2007 / 2008 GMC 2500HD Diesel

Fin-chaser - 10/21/2007 3:47 AM

Spent the last couple of weeks trying to hone in on the right truck for towing and driving back and forth to work everyday. Narrowed it down to the 2008 GMC extended cab diesel 2500 HD and the Ford Power Stroke F-350 super cab.

Went out shopping at my local dealers yesterday to try to close a deal.

Well, bottom line.... ended up trying to make a deal for a Ford F-250 crew cab power stroke, lariat pkg. Very nice truck and it seems to have every thing that we would need to fill the bill.

Negotiated for three hours and ended up 2 thousand apart !!!!! Had to walk away as they could not meet my budget.

Back to the drawing board..... oh by the way, GMC for the same crew cab truck with slt pkg was about $ 8K higher in price. Very nice truck, but not worth the extra cash.

Not sure how I'm going to bridge the gap on the difference in cost on the Ford...............

Fin-
FIRST, pat yourself on the back for NOT getting the F350. Them things will beat your brains out. The F250 rides MUCH better but, my best friend has one and can't get any mileage out of it but, he thinks he's Richard Petty, got the chip, exhaust, etc. It runs like hell, but again, no mileage. As to the SLT, why you need that? It is a truck. That's the reason I went with the LT as I use mine as a truck and didn't matter about all the luxuries, I got a car for that.
Might try and find you a low mileage 05-06 floating around your area if these new 07's aren't doing all that good on the mpg.
Just my wortless 2 cents. Good luck in your hunt.
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Old 10-21-2007, 07:34 PM
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Default Re: 2007 / 2008 GMC 2500HD Diesel

not sure about the price where you are but around here a Chevy 2500 hd diesel loaded with all the bells is around 38 to 42 depending on a few factors. My wife was looking at an extended cab 07 loaded, leather, onstar, heated seats etc for 38643. not sure if she will get it, I would reather get a Yukon XL since I have an 01 2500 HD duramax/alison Dealer in Marianna Fl , "Hopkins" had in the paper 2 or 3 weeks ago a loaded crew cab dmax for 38500.
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Old 10-22-2007, 11:14 AM
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Default Re: 2007 / 2008 GMC 2500HD Diesel

Just closed the deal on a new 2007 Sierra, 2500HD diesel, SLT pretty much within my budget. I've dealt with this dealer on two other GMC's and they worked pretty hard to help me find the deal. While I was looking for a 2008, I guess I can settle for the 2007 - no changes were made between 2007 and 2008 per the dealer. They are giving a $3,500. rebate on the 2007 2500's - that is what made the deal work.

I'll post a pic or two after I take delivery later this week. Can't wait to see how the Duramax will perform on the highway as well as towing the new Hydra Sport.

Thanks to all who weighed in with advice. I appreciate everyone's comments and thoughts.

Thanks,
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Old 10-22-2007, 12:14 PM
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Default RE: 2007 / 2008 GMC 2500HD Diesel

Great Truck!
Congrats... you may not realize it, but you have just bought yourself a 7000# hot rod!

Randy
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Old 10-22-2007, 01:24 PM
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Default RE: 2007 / 2008 GMC 2500HD Diesel

CrazyHorse - 10/22/2007 12:14 PM

Great Truck!
Congrats... you may not realize it, but you have just bought yourself a 7000# hot rod!

Randy
Yep, what Randy said. Congrats.
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Old 10-29-2007, 03:36 AM
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Default RE: 2007 / 2008 GMC 2500HD Diesel

Well, I finally settled on the GMC 2500 HD, diesel SLT package. Very nice truck, but will take a little getting used to as I have been driving a Yukon Denali for the past two years.

Here's a couple quick pics...... it was gett ing dark so I'll need to take some in better light.








Hauled the boat out for the season yesterday and it was very smooth.

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Old 11-03-2007, 11:23 AM
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Default RE: 2007 / 2008 GMC 2500HD Diesel

Couple of more pics with the 2900 hooked up ready to go to the dealer yesterday to be winterized.






Glad I did this yesterday as we have 60 MPH winds and very heavy rain today !!!!

This truck tows like a dream.......... almost like having a hot rod..... I think that it has more balls that my corvette !!!!!
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Old 11-03-2007, 11:43 AM
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Default RE: 2007 / 2008 GMC 2500HD Diesel

Looks Good Fin-Chaser,
How did it handle that package....?
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Old 11-05-2007, 06:08 PM
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Default RE: 2007 / 2008 GMC 2500HD Diesel

nice ride,little info for the truck, put you a good performance module in her and you will see a big diff in the pulling side and milage and will not void warrenty, good luck
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Old 11-06-2007, 03:55 AM
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Default RE: 2007 / 2008 GMC 2500HD Diesel

wickeditch - 11/5/2007 6:08 PM

nice ride,little info for the truck, put you a good performance module in her and you will see a big diff in the pulling side and milage and will not void warrenty, good luck
itch,

Thanks for the tip. Do you have any idea which program, etc... and where to get ???

The truck is very nice, but I am only seeing about 16.5 mpg and I have changed my driving habits - nothing over 70 mph anymore (big change for me)....... diesel just hit $3.40 in my area and seems to be going up every other day !!!!!!

Any savings would certainly help the cause.

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