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Chevy Silverado and GMC Sierra Duramax Fuel Mileage

621 messages,  Last post on May 30, 2013 at 3:47 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 4 of 62

#32 of 621 Re: DURAMAX FUEL MILEAGE [blackmax] by larrydi

Apr 29, 2005 (8:27 am)

Replying to: blackmax (Sep 19, 2004 2:26 pm)
I have an 2002 hd allison ext cab 4x4 GMC Duramax, my mileage is 17 to 18 on the highway empty, 14 to 16 city empty but when I tow anything my mileage drops considerably. I have a 7,000 lb. 5 th wheel, not a high one ether and get 10 to12 mpg towing it. A double snowmobile trailer, maybe 2,000 lbs loaded and get 14 mpg towing it and a couple of smaller trailers which still get aroud 14 mpg. It seems whenever I put anything on my ballhitch my mileage drops way to much, the reason I purchased a diesel was because I,am always towing something and thought my mileage would hardly change with the smaller trailers. NOT SO. I shifted my allison tranny manualy the other day just to see what the pattern was like, I bought each gear to red line 3200 rpm. 1 st gear was 25 mph, 2 nd was 40 mph, 3rd was 51 mph, OD I didn,t bother with but I know it only does 96 mph top end. I have 3.73 in it also. On the highway I drive about 67 mph at 2000 rpm. Any ideas to improve this would be greatly appreciated. TKS.

#33 of 621 D/A mileage by the_vfox

Apr 30, 2005 (6:33 pm)

At 23k miles, I get 17-20 unloaded, 10 - 14 towing the 5th Wheel, depending on terrain headwind etc.
 
 
 
2004 Duramax Silverado Crew Cab

#34 of 621 2005 Duramax Fuel Mileage by gemini5362

May 09, 2005 (6:29 pm)

I have just purchased a 2005 HD 2500 Crew Cab Silverado it has the duramax diesel engine and 3.73 gears. I am getting 14 to 16 mpg on the interstate running about 75mpg. With the truck unloaded. Last weekend i was pulling a 16 ft flatbed trailer with less than 1000 pounds of furniture on it my mileage dropped down to 11 to 12 mpg is this normal for a new engine I have about 1000 miles on it. I have been told as the engine begins to break in I will see an increase in fuel mileage at what point should I start seeing an increase.

#35 of 621 Re: Diesel truck advice for girls! [justatrucker] by laser2

May 31, 2005 (7:04 pm)

Replying to: justatrucker (Mar 04, 2005 3:42 pm)
I am in the process of ordering a 2005 Duramax and the dealer told me that the lowest rear axle ratio available is the 3.73....anyone know if this is true...??

#36 of 621 Duramax mileage and service by chvylvr

Jun 01, 2005 (5:54 pm)

I drive and 2001 2500hd with the duramax and I love This truck. Yes, I had the injector issue and GM promptly replaced then under warranty with the upgraded models. An aggravation yes, but the "quiet diesel" technology was new and things happen. The Allison transmission seems bulletproof as I have dragged a loaded horse trailer 25 miles with the trailer brakes locked up and didn't realize it till I stopped and saw the smoke from the wheels! I saw no increase in tranny temp! Fuel mileage is probably 17 in city and a stable 20 mpg on the hwy running 70-80 mphs.

#37 of 621 Re: DURAMAX FUEL MILEAGE [blackmax] by honda929

Jun 02, 2005 (8:44 am)

Replying to: blackmax (Sep 19, 2004 2:26 pm)
I HAVE A 2005 2500HD DURUMAX LB 4X4. WHEN I FIRST BOUGHT THE TRUCK I WAS GETTING AROUND 17MPH. NOW THE BEST I GET IS 13MPH. I KNOW THE 4X4 MAKES IT WORST. I WAS TALKING TO A GUY WITH THE SAME TRUCK WITHOUT 4X4 WHO GETS 17MPG. BUT I HAVE TO SAY ITS GREAT TO GET 13MPG WHEN YOUR TOWING A TOY BOX OUT TO THE DESERT. SINCE ITS NOT AN EVERYDAY DRIVER I DONT REALLY THINK ABOUT THE MILEAGE.

#38 of 621 Re: [luke6] by honda929

Jun 02, 2005 (8:58 am)

Replying to: luke6 (Apr 05, 2005 9:29 pm)
DO YOU KNOW ANYTHING ABOUT TIRES ON THE STOCK WHEEL. I HAVE A 2005 2500HD LB 4DOOR 4X4. I HAVE ALLOY WHEELS WITH THE STOCK TIRE. THE STOCK TIRES LOOK REALLY SMALL ON TRUCK. I DONT WANT TO LIFT IT OR PUT BIGGER RIMS ON IT. I WAS WANDERING IF YOU KNOW A GOOD ALL TERRAIN TIRE FOR THE STOCK RIMS. ONE MORE QUESTION OFF THE TIRE SUBJECT. I GO TO THE DESERT A LOT SO MY CABIN FILTER SMELLS LIKE DUST. BUT I CANT FIND WHERE IT IS. DO YOU KNOW WHERE AND HOW TO GET TO THE CABIN FILTER. THANKS.

#39 of 621 ALL TERRAIN TIRE SIZE by honda929

Jun 02, 2005 (9:15 am)

DO YOU KNOW ANYTHING ABOUT TIRES ON THE STOCK WHEEL. I HAVE A 2005 2500HD LB 4DOOR 4X4. I HAVE ALLOY WHEELS WITH THE STOCK TIRE. THE STOCK TIRES LOOK REALLY SMALL ON TRUCK. I DONT WANT TO LIFT IT OR PUT BIGGER RIMS ON IT. I WAS WANDERING IF YOU KNOW A GOOD ALL TERRAIN TIRE FOR THE STOCK RIMS. ONE MORE QUESTION OFF THE TIRE SUBJECT. I GO TO THE DESERT A LOT SO MY CABIN FILTER SMELLS LIKE DUST. BUT I CANT FIND WHERE IT IS. DO YOU KNOW WHERE AND HOW TO GET TO THE CABIN FILTER. THANKS.

#40 of 621 CapsLock by KCRam@Edmunds HOST

Jun 02, 2005 (6:42 pm)

Hi honda929 and welcome to Edmunds!
 
Just as a matter of info, typing in all capital letters on tthe internet is difficult to read and in most circles is considered shouting. When posting, can you turn off your CapsLock? Thanks!
 
kcram - Pickups Host

Messages Page 4 of 62

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