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Chevy Silverado and GMC Sierra Duramax Fuel Mileage

506 messages,  Last post on Nov 30, 2009 at 5:21 PM

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What is this discussion about? Chevrolet Silverado 2500HD, Chevrolet Silverado 3500, GMC Sierra 2500HD, GMC Sierra 3500, Diesel, Fuel Efficiency (MPG), Truck

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#164 of 506 Sessions by ssessions Jan 29, 2006 (8:26 pm)
I have a 2001 Duramax, that I purchased in Dec. When I stop at lights or whatever, the motor will surge a little. Doesn't do it when driving. I know they will surge during warm-up from a start up. Any one have a solution for this problem? Replies to this message: bigbilly (Mar 23, 2006 7:49 pm)
#165 of 506 '02 GMC Duramax by break80 Feb 01, 2006 (1:56 pm)
Replying to: chani (Jan 16, 2005 8:34 am) I have 78k miles on mine. consistently 16.5-18.5 mpg. Hmmm? maybe I should also check the psi on my tires.
#166 of 506 Re: DURAMAX FUEL MILEAGE [stoneg] by beachin Feb 01, 2006 (5:51 pm)
Replying to: stoneg (Sep 25, 2005 5:14 am) I have a 2004 GMC 2500HD 4x4 w/Duramax. I would like to know what brand of leveling kit you used on your truck, and did it alter the smooth original ride? Sincerely, AuctionMP Replies to this message: clow123 (Feb 02, 2006 9:14 am)
#167 of 506 Re: DURAMAX FUEL MILEAGE [beachin] by clow123 Feb 02, 2006 (9:14 am)
Replying to: beachin (Feb 01, 2006 5:51 pm) I have a 2005 chevy 2500 4X4 and I had a torsion bar key installed, it raised the front appox. 2.5" and did not appear to effect to original ride. It does allow for 285 75r16 tires without rubbing. There are a number of manufacturers you can choose from on ebay, cost about $100 with shipping. I had a tire place do mine, parts, install and front end alignment for $200.
#168 of 506 Re: 2006 2500hd duramax 6sp auto fuel mpg [fredk2] by clow123 Feb 02, 2006 (9:22 am)
Replying to: fredk2 (Jan 18, 2006 6:35 pm) I have a 2005 2500hd crew cab 4X4 duramax with 33,000 miles, 285 tires, K&N air filter, and Predator Downloader. I drive a lot of miles and use the economy mode on my downloader. I consistantly get 14.5 - 15.0 mpg in town and just recently got 19.2 mpg on a trip (full tank). I drove 75 mph most of the way and 30% 55-65mph. I have seen a considerable increase in fuel economy in the last 10,000 miles or so.
#169 of 506 Re: 2005 Duramax- Can't get over 10mpg [donwy] by lmoore1 Feb 02, 2006 (2:42 pm)
Replying to: donwy (Jan 03, 2006 10:50 pm) I bought a 2006 Duramax in Oct 2005. 4X4 Reg Cab. I have 3000 miles on it. Best I can tell I am getting abt 17.5 MPG highway driving [1500 to 1600 RPM] and abt 14.0 MPG pulling a 4500# 5th wheel. My average for 3000 Miles is 14.7 MPG with abt 2/3's pulling the light trailer. Some say it will go up at 10000 miles. True or False??? Best I can tell the milage hasnt changed since the first tank. Can anyone point me to a 2nd fuel filter kit??? Seems I recall one that will mount on the engine near the right battery. Any help appreciated.
#170 of 506 Buying another.. by spademan Feb 02, 2006 (7:59 pm)
Anybody have a really good place to buy a used/new duramx in or near eastern iowa?? Any help or suggestions would be great! Replies to this message: 31050 (Mar 22, 2006 8:09 pm) likearock (Mar 18, 2007 2:42 pm)
#171 of 506 Allison vs. standard tranny?? by coadman Feb 03, 2006 (8:47 am)
I am looking at purchasing a 03 or newer 2500HD with the duramax. The heaviest thing that i will be pulling would be a cattle trailer loaded down would be around 12000# and other misc. trailers would be pulled(live on a farm/ranch). Would the standard tranny be alright for this or should i look for the trucks that have the allison? Replies to this message: spademan (Feb 03, 2006 1:07 pm)
#172 of 506 Re: Allison vs. standard tranny?? [coadman] by spademan Feb 03, 2006 (1:07 pm)
Replying to: coadman (Feb 03, 2006 8:47 am) if your going to buy a diesel HD why not get the HD tranny?? One thing for sure, you would never have to worry about it, can that be said for the standard tranny?
#173 of 506 coadman by catam Feb 03, 2006 (1:09 pm)
The only auto tranny avail with the Dmax is the Alison. If you don't mind shifting the gears manually the six speed gearbox is considered very good, (both Ford and GM use the same manual tranny.) The real issue is that the NEWER (i believe post 2004?? anyone?), Dmax's with the Alison are rated with more HP and torque, the manual shifters get the detuned engine. Replies to this message: coadman (Feb 03, 2006 6:05 pm)

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