Last post on Sep 27, 2013 at 11:50 AM
You are in the Diesels
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Chevrolet Silverado 2500HD, Chevrolet Silverado 3500, GMC Sierra 2500HD, GMC Sierra 3500, Diesel, Fuel Efficiency (MPG), Truck
#212 of 623 Re: fuel mileage on the new 6.6 duramax [bcheep]
May 22, 2006 (3:45 pm)
Thanks bcheep. How do you like the hp on the new duramax? Does the extra 50hp make a big difference. I just test drove one yesterday and I was really impressed. I am sure the 6 speed allison helps alot too.
Jun 20, 2006 (5:38 pm)
I watched a mythbuster episode where they tried different fuel additives. Although they tried them in a gasoline powered car one of the ones that they tried (adding acetone) is supposed to increase diesel mileage also. The mythbusters episode showed where this actually decreased fuel mileage somewhat. I agree with the person that said for better fuel economy drive slower. I would expect the 2004 with the 6 speed allyson to get better mileage if you get the same engine (LLY) When I test drove one of those at 2000 rpm I was doing 75 miles an hour. With my 2005 and the allison 5 speed I am only doing 65 miles an hour.
I looked at the label on a quart of Mobile 1 synthetic oil for trucks and suv's it showed that it was authorized for use in all turbo diesels and showed that it passed the GM standard. Since Mobile 1 came stock in my new porsche and stock in my sons BMW motorcycle I believe it probably should hold up well enough in my diesel truck
#214 of 623 Re: fuel mileage on the new 6.6 duramax [valdezvip]
Jun 25, 2006 (11:07 am)
I have a 2006 2500 Duramax Crew long bed and am getting 17-18 MPG around town. Truck has 9,000 miles on it. A friend of mine has a '01 Duramax and he gets 20 MPG around town. I'm told MPG will improve with mileage. I sure hope so. I was considering a free flow exhaust and maybe another air filter to improve MPG. With diesel fuel prices(thieves) above regular gas, I sometimes wonder if I would have been better staying with a gas motor. I really do like the truck though, I had an '02 1500 Silverado Ext. and moved up to the diesel for towing the travel trailer.
#215 of 623 Over heating
Jun 25, 2006 (8:02 pm)
As in Message 207, 05 Duramax with Banks, I am now experiencing high eng. temps and trans temps.. Is it customary to see 225 engine and 220 trans in heat of 103 while towing a 6k trailer/sled? I had the air off and the incline was very minimal and was going 60 when it started to creep up. Honestly, I am almost at my wits end with GM products. I love the truck and its style, but it has been a problem since day 3. I saw Fords, I know, pulling bigger trailers with their air on and doing about 65 - 70 with no issues. Any thoughts? HELP
#216 of 623 Re: DURAMAX FUEL MILEAGE [blackmax]
Jun 27, 2006 (11:29 am)
Hey I bought a new 2006 Duramax 2500HD 360 HP and made it 2 miles from the dealership and broke down. I shut the truck off and when I went to start it, it fired and then shut off and wouldn't restart. I have herad they are having some problems with fuel issues. Can anyone tell me anymore information? The truck they gave me to drive has 3900 miles on it and gets 19mpg. Thanks
#217 of 623 Re: DURAMAX FUEL MILEAGE [highlander2]
Jul 02, 2006 (5:49 am)
I guess I will be buying one tomorrow so I don't know the mileage but ???
What happened to the truck?
I hope I can get mine home before it quits...
#218 of 623 2005 Duramax. . . Drop in Milege
Jul 03, 2006 (12:36 pm)
I own a 2005 Duramax with the Allison Transmission. My mileage when new was 16-19 mpg. The vehicle currently has 20,000 miles on it. For the past 6 months I have noticed the mileage being 13-16 average. From the start, I have the Edge with Additude chip. I had run it mostly on "3". . the drive mode. With the drop in mileage I have tried different settings and it doesn't appear to change much. I had the dealership check it out and they said everything tested fine. They also suggested trying to run it on "0" which means the Edge is turned off. The mileage did not increase. Has anyone else experienced this drop in mileage from when the vehicle was new? Seems like most people are getting better mileage when the engine has more mileage on it. I love the power and the truck but am very dissatisfied with the milege. Any help would be appreciated.
#219 of 623 Re: 2005 Duramax. . . Drop in Milege [bob129]
Jul 03, 2006 (8:59 pm)
I had the same issue with my Banks setup. I hadn't replaced my fuel filter until 40k, big mistake. It is to be done every 15k. Once I replaced it I went back up to 22 MPG's.
#220 of 623 Re: Crazy Noise [akenaten]
Jul 07, 2006 (8:12 am)
This is the fast idle feature that is new on the 2006. It places a load on the engine when cold so that it warms up quicker. Mine does the same.
#221 of 623 Synthetics and the Duramax
Jul 07, 2006 (8:15 am)
I plan on using Amsoil synthetics in my new 2006 Duramax. Does anyone have any suggestions on how many miles to put on it before doing so to make sure proper break in has occurred? I am still averaging around 15.2 mpg and only have 2500 miles on it.