GMC HD2500/HD3500 fuel milage ?

[-JR-]

I am in the process in ordering in a new GMC HD2500 /HD3500 with a 6 L gas engine
The only gear ratio is 4:10
Just wonding if any one has one and what is the Fuel milage is, as dealers have no specs ?

ps Please don't come on saying i am better off buying a diesel.
This truck will be my daily drive to work truck in Edmonton weekends will be pulling my boat with a truck camper
Heavy duty Tech last 30 years.

[Norwest Alta]

Going by the computer on my 2013 3500 I'd get about 16l/100km. When pulling my holiday trailer I'd get 30l/100km or more. My experience after having 2 6l is that they're dogs.

[-JR-]

wow thats like 8 miles to the gallon when loaded. was hopping for around 15 miles per gallon loaded.

[Norwest Alta]

Originally Posted by -JR-

wow thats like 8 miles to the gallon when loaded. was hopping for around 15 miles per gallon loaded.

Lol. Good luck. They make a lot of noise but not much action.

[AdAMxr]

Had two for work trucks. Very thirsty but extremely reliable.

[Lefty]

My average running around empty is 22 liters/100. Straight highway with the tonnou (sp) on I have gotten 17l/100. Pulling the gooseneck it runs about 25 1/2 per 100 but has been as low as 28/100 when in high winds. Mine is a 4 door, 8 foot box, single rear wheel, and have Mickey Thompson MTZ tires for summer.

[Deasoninc]

I have a 2016 2500hd 6L , I am pretty happy with it. I too went from a diesel to the 6L gas. Running empty its not to bad. Im gonna be heading to Milkriver this weekend to do some goat spotting so that will be the biggest trip to date for this truck . Ill keep track of the mileage and get back to you . I did notice the mileage not being to great while hauling the trailer(s) I have but that was expected.

[Immigrant]

2016 GMC 6L. All highway, with very little traffic.


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[reddeerguy2015]

I own an older one. It's a 2006 with about 400k going strong. Change a water pump once, and did spark plugs.


Other than that nothing but oil and air filter changes.

Extremely reliable.

But an absolute pig on fuel. About 320 to 380km to a tank.

Goodluck.

[Bourbon Outdoorsman]

I own a 2008 chevy 2500HD LTZ that gets 14mpg on average for highway. 8-9mpg when towing. But its a great motor and never had an issue with it yet (knock on wood). 290000km and still going strong. I get 550-600km per tank, depending how i drive


The truck handle's Imperial Oil's roads up at Esso near cold lake with no issues. I havent had to do anything to the motor or drive train yet. Just shocks, breaks and ball joints and of course the scheduled oil changes for motor, diffs and tranny. Very reliable truck and i hope to surpass 500000km with it

[rembo]

For what it's worth I recently picked up a one owner, 115,000 Km, 2004 2500HD 6L long box ext cab 4x4 with a 4.10 rear axle.

It runs between 17 and 18 L/100 combined city and highway. Dips to around 16.5 if I don't go into the city much. Looks like a newer one isn't much better.

In the same truck with a Duramax you can take 30% off of these numbers , sometimes more. My 2011 Duramax runs 12.5 - 13.0 in the same scenario. Dips into the 10's on the highway.

[Pilsner Man]

I have a 2016 2500HD.

Most of my driving is highway so i cant comment on city mileage.

Best i have got according to computer is 12.8l/100. That was empty with a canopy on going 100km.

You notice a huge difference between 100km/hr and 120km/hr with the 4:10 rear end.

I average around 18l/100 hauling a quad on the highway at 115.

Towing a 34ft holiday trailer i get around 28l/100.

My last truck was a dodge 3500 diesel and i dont really miss the deisel that much with this truck.

[jpohlic]

I have a 2012 GMC 3500 crew cab long box with the 6.0, not sure of gear ratio. I use 16-17l/100km empty and 27-28l/100km with a 3000lb camper. I usually drive 100-110 km/h. When I tow the 2000lb boat with the camper on I still get 27-28l/100km. Not sure what I get when towing the boat with the box empty, I think it's around 23-24l/100km

[couleefolk]

Just wondering if the 6.2l is an option for the larger trucks? I find it hard to grasp that the replacement for the old 7.4 and 8.1 can't do a lot better on fuel. My old 7.4s would average around 18.8l/100km empty (7000lb crewcab-longbox 4x4). With todays technology, trucks should be doing better.