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Chevy Silverado and GMC Sierra Duramax Fuel Mileage

620 messages,  Last post on Dec 15, 2012 at 3:45 PM

You are in the Chevrolet Silverado & GMC Sierra Forum.

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

Messages Page 61 of 63

#593 of 620 Re: my results [hillsdale56] by barrail

Sep 12, 2011 (5:19 am)

Replying to: hillsdale56 (Sep 01, 2011 11:36 am)
May I ask, what modifications were made and to what year D-max?

#594 of 620 hello by hillsdale56

Sep 12, 2011 (6:21 am)

What I did was remove the cat and stock muffler. Installed magnaflow number 129909. Pipe is stock size. Truck does. Not smoke at idle or when running. Also have a tuner froom diesel domiination. Ruunniing 25 lbs of boost at 1600 rpm. Look into his tuner. Steve shellly s a good guy and kknnows what he's doing. My truck is a 06. 3.73 4wd hd.. now at 420 hp. To answer the post about california, I not familar wth your emission. Testing. Dooo they put a snffer n the tail pipe, use a mirror to look under the truck? Here n new york we don't have that.no. emiissiion testng on diesels

#595 of 620 06 GMC Sierra Allison by chevyhorsegurl

Oct 03, 2011 (9:07 am)

Looking for some advice here folks...
i drive my truck about an hour each way to work daily, purchased this truck in may of 2011 and was thrilled to see it was getting 18mpg on the drive home! After having the truck a bit i put a soft tonnaue cover on it and immediatly noticed a drop in fuel mileage, to date the truck has been getting around 15.9-16.2 mpg. Wanted to improove mileage so we put cold Air intake system with K&N and did Exhaust with hypertech programmer on stage 2. mileage has not gone up at all since the updates
Any advice would be much appretiated!!!

#596 of 620 Re: 06 GMC Sierra Allison [chevyhorsegurl] by barrail

Oct 03, 2011 (6:28 pm)

Replying to: chevyhorsegurl (Oct 03, 2011 9:07 am)
did you rely on the on board DIC to determine your mileage or did you divide gallons put in to miles driven actual.

#597 of 620 They FIXED my turbo and the fuel mileage dropped by coontie66

Oct 06, 2011 (6:31 am)

Back 1.5 years ago the check engine light came on so I took it to the local Chev garage... Five trips later they eventually installed a new turbo in the 06 Diesel Chev. The fuel mileage never returned to its pre FIX of nearly 21 on the road. Now its about 17-18 on the road.
 
This week the check engine light came on again so its back to the Chev dealer. This time he says its a glow plug and the EGR/ERG pump and a dirty air filter. The truck went out of warranty in July this year based on years NOT mileage... it now has 45300 on it. During the discussion he told me that the new turbo that they put on about a year ago produces more boost than the factory model AND less fuel mileage. Not happy with that. At first the dealer wanted $1050 to fix my problem but when he was told I would trade it in first he decided to extend my warranty a BIT and cover most of the costs. My NEW cost is about $250. What I didn't tell him is my next attempt to buy a diesel PU would be a Dodge. Sure wish they were quiter.
 
I will have to say this 06 Chev is rapidly approaching the top of my list of bad vehicles. So far the Chev Vega of 72 fame and the 80 VW Rabbit are on the top of the list with the 99 Ford diesel in 3rd place. This vehicle is catching up fast and could take 3rd place next year.

#598 of 620 06 truck fixed but fuel mileage suffered by coontie66

Oct 28, 2011 (9:42 am)

About a year ago I had the turbo replaced on my 06 Chev diesel. I thought the fuel mileage had suffered and last week the local dealer told me tha the new turbo produces more boost and the miles is off about 3 mpg. Darn I didn't need more boost just more mileage.
 
What to do??? My mileage is about 17---------------grrrrrrrrrrr.
 
Mine now has 45K on it.
 
Had it in for a gloplug and a ERG pump... warranty ran out in July but they covered both with a 100 buck payment. At first they wanted $1050 until I complained.

#599 of 620 Re: 06 truck fixed but fuel mileage suffered [coontie66] by gmcustsvc

Nov 01, 2011 (9:54 am)

Replying to: coontie66 (Oct 28, 2011 9:42 am)
How has it been running, aside from the less efficient fuel economy?
 
Best,
Sarah
GM Customer Service

#600 of 620 Re: 06 truck fixed but fuel mileage suffered [gmcustsvc] by coontie66

Nov 01, 2011 (2:05 pm)

Replying to: gmcustsvc (Nov 01, 2011 9:54 am)
I have only really pulled one time with it since the new turbo and that was with my 12500lb camper. It did really fine.. I have not chipped it yet but its loaded with power.

#601 of 620 Re: 06 truck fixed but fuel mileage suffered [coontie66] by cefloyd

Mar 15, 2012 (8:39 am)

Replying to: coontie66 (Nov 01, 2011 2:05 pm)
what kind of millage did you get pulling your camper i also have a 12500lb camper and I am looking at a 06 hd3500with a 6.6 or a F 350 super duty with a 6.0 and I know alot of bad stuff said about the 6.0 just checking my options

#602 of 620 Re: 06 truck fixed but fuel mileage suffered [cefloyd] by coontie66

Mar 15, 2012 (7:26 pm)

Replying to: cefloyd (Mar 15, 2012 8:39 am)
I was getting 11 mpg pulling my camper before the turbo change... I have not pulled it since the new turbo unfortunately. Both of us have been diagnosed with cancer in the past two years and treated. I think we are fine now just waiting to get time to travel again.. I know that the mileage on the road without the turbo dropped about 2.5 mpg.

Messages Page 61 of 63

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