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Chevy Silverado and GMC Sierra Duramax Fuel Mileage

496 messages,  Last post on Nov 11, 2009 at 1:27 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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#103 of 496 DURAMAX THROTTLE RESPONSE by series60 Oct 02, 2005 (7:15 pm)
I have a question for all ya's, I own a '05 silverado with a duramax. The problem that I am experiencing is that from time to time especially when I am in the throttle passing someone the engine would die down and won't go over 2000 rpm. I acts like when the fuel would start to gel in the winter. Then I would have to get totally out of the throttle and wait a couple of seconds and then usually it would go back to normal but not all the time. I put a scanner on it and the are no DTC's in the ecm. Did anyone have this problem before? I am thinking that it might be emission related but not sure. If anyone has any input please let me know. THANKS!! Replies to this message: aarongd (Oct 27, 2005 12:30 pm) aarongd (Oct 31, 2005 3:26 pm)
#104 of 496 Re: Great Truck [monteboy1] by series60 Oct 02, 2005 (7:26 pm)
Replying to: monteboy1 (Sep 30, 2005 9:44 am) Your lucky!!! my '05 is lucky to see 15.6 highway and I rarely get in the throttle.
#106 of 496 Re: Edge Attitude Monitor Mount [stoneg] by stoneg Oct 07, 2005 (6:14 am)
Replying to: stoneg (Oct 02, 2005 6:01 pm) I purchased the black molded plastic mount that says it fits all GMC's, Chevy's, Fords, and Dodges. It doesnt fit, althought it may be due to the sunroof option.
#107 of 496 Sunroof Option on a 2005 2500HD by stoneg Oct 07, 2005 (6:16 am)
Is there a difference in the overhead console on the 2005 2500HD with the sunroof option and ones without??? Aren't they the same size? Replies to this message: stoneg (Oct 23, 2005 5:21 am)
#108 of 496 Re: Love my 2003 DM 2500 HD 4x4 Crew Cab [aarongd] by stoneg Oct 07, 2005 (6:25 am)
Replying to: aarongd (Sep 29, 2005 6:07 pm) I put about 5 oz. in my 26 gallon tank, and I picked up about 1 mpg, but I just installed the Edge Juice programmer, and put in on level 3...picked up 1.7 mpg, and 75 HP!!! I was getting over 2 mpg better, but when you have an extra 75 HP, its hard not to use it. I spoke to the owner of a Diesel specialty shop, and he has never heard of using the Acetone, but is now researching it. He is also skeptical of using biodiesel, saying that nobody knows the long term effect on the engine. Any comments on biodiesel? Also, I think I found out why my mpg suck so bad, 4.10 gears, instead of the 3.73 Replies to this message: series60 (Oct 07, 2005 6:44 pm) stoneg (Oct 10, 2005 7:57 am) franks71vw (Dec 12, 2005 10:24 am)
#109 of 496 Re: Love my 2003 DM 2500 HD 4x4 Crew Cab [stoneg] by series60 Oct 07, 2005 (6:44 pm)
Replying to: stoneg (Oct 07, 2005 6:25 am) I am a diesel mechanic for about ten years and the fleet company that I work for uses veg. oil mixed fuel in some of thier trucks since they got them, and those trucks have over three hundred thousand miles on them and still run like a top. the mixed diesel is similiar to biodiesel cause both use veg. oil. I know some guys that use biodiesel and the see no difference. But, as for the acetone thing I wouldn't recommend using it cause it has a lower flash point than diesel does and it will actually cause the motor to pre ignite causing misfires. Its on the same basis as putting gas in your diesel. cause gas has a lower flashpoint than diesel and will do the same thing. Replies to this message: stoneg (Oct 10, 2005 7:57 am) franks71vw (Dec 12, 2005 10:24 am)
#110 of 496 Re: Love my 2003 DM 2500 HD 4x4 Crew Cab [series60] by stoneg Oct 10, 2005 (7:57 am)
Replying to: series60 (Oct 07, 2005 6:44 pm) Yeah, I am a little nervous about adding it again. This past fill up, I added an additive by Stanadyne that I got from Shivers Diesel, and along with the Edge Juice programmer on level 1, I went from around 10 mpg to now almost 14. The exhaust is on order, and hopefully I will get another 2 mpg increase if you believe all the hype.
#111 of 496 Well I purchased the 2006 Dmax 2500HD 4x4 Crew, 3.73 by clongwell Oct 13, 2005 (2:15 pm)
I drove the Dmax roughly 500 miles the first day. Trying to get it back home. I averaged about 17mpg mostly highway doing 75mph. The next day having to drive the last 100miles I decided to keep it around 1600rpm. That put my speed at around 63 in 6th gear. Trying to keep it in peak torque range. Averaged 22mpg freeway only. It seems to average about 15 mpg mixed. The 6th gear really helps with increasing the mpg. Replies to this message: stoneg (Oct 13, 2005 5:47 pm) uhlenhakebrian (Oct 15, 2005 8:20 pm)
#112 of 496 New DMAX breaking in FYI by clongwell Oct 13, 2005 (2:22 pm)
I am following this article for break in. http://www.thedieselstop.com/contents/getitems.php3?Breaking%20in%20a%20Diesel%20Engine   And on DMAX the www.thedieselpage.com has alot of info.

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