Sign In Join 



Chevy Silverado and GMC Sierra Duramax Fuel Mileage

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

You are in the Diesels Forum. Your Host is kcram

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


Messages Page 12 of 52
1
...
9
10
11
12
13
14
15
...
52
Prev
Next
Last
Go To Msg #
Search This Discussion

#106 of 506
Re: Edge Attitude Monitor Mount [stoneg] by stoneg
Oct 07, 2005 (6:14 am)
Reply

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 506
Sunroof Option on a 2005 2500HD by stoneg
Oct 07, 2005 (6:16 am)
Reply
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?
#108 of 506
Re: Love my 2003 DM 2500 HD 4x4 Crew Cab [aarongd] by stoneg
Oct 07, 2005 (6:25 am)
Reply

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
#109 of 506
Re: Love my 2003 DM 2500 HD 4x4 Crew Cab [stoneg] by series60
Oct 07, 2005 (6:44 pm)
Reply

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.
#110 of 506
Re: Love my 2003 DM 2500 HD 4x4 Crew Cab [series60] by stoneg
Oct 10, 2005 (7:57 am)
Reply

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 506
Well I purchased the 2006 Dmax 2500HD 4x4 Crew, 3.73 by clongwell
Oct 13, 2005 (2:15 pm)
Reply
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.
#112 of 506
New DMAX breaking in FYI by clongwell
Oct 13, 2005 (2:22 pm)
Reply
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.
#113 of 506
Re: Well I purchased the 2006 Dmax 2500HD 4x4 Crew, 3.73 [clongwell] by stoneg
Oct 13, 2005 (5:47 pm)
Reply

Replying to: clongwell (Oct 13, 2005 2:15 pm)

so does the 3.73!!! The 4.10 in the '05 sure isn't helping.
#114 of 506
Re: Well I purchased the 2006 Dmax 2500HD 4x4 Crew, 3.73 [clongwell] by uhlenhakebrian
Oct 15, 2005 (8:20 pm)
Reply

Replying to: clongwell (Oct 13, 2005 2:15 pm)

Just curious if your mileage is calculated manually by you when you fill the truck or if you are reading off of the DIC. I have found that the DIC mileage is way off. I have an 2004.5 LLY motor in my GMC Sierra Crew Cab Short box. My lifetime mpg average at 15,000, calculated by me from fuel reciepts is 17.8, this was a mixture of highway and city. I just finished putting a predator programmer (fuel economy mode selected), MAC intake, and a Jardine 4" exhaust. Today I took the family to Chicago and back running 75mph the whole time and average 20.1mpg based off of actual miles traveled divided by the actual fill...the DIC showed 26.5mpg??? I am very pleased with 20mpg. I believe I can get up to 21mpg if I hold it at 65mph, or essentially keep the motor below 2000rpm which is where everyone on the forums states they get the best mileage. Glad to hear you have the Allison with the 6 speed.
 
Cheers,
 
Brian

Messages Page 12 of 52
1
...
9
10
11
12
13
14
15
...
52
Prev
Next
Last
Go To Msg #
Search This Discussion
To POST a message, please Sign In.

New? Join Now!

Forum Tools

Please sign in.
Email Address:

Password:

Forgot Password?

Search Forums

Enter Keyword(s)

Advanced Search

Browse by Vehicle



View All Vehicles
Advertisement
Ask the Community
See What People Are Asking

Browse by Board

Browse by Topic


View All Topics

Today's Chats

Advertisement