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Chevy 4x4 2500HD with the 6,6 gas engine

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Chevy 4x4 2500HD with the 6,6 gas engine

Old 09-22-2020, 07:00 AM
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Default Chevy 4x4 2500HD with the 6,6 gas engine

Been looking and can't nail down gas mileage info, if anyone owns one what are you getting city and highway unloaded.

Thanks

Simon
Old 09-22-2020, 07:30 AM
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I am always amazed that people look at such a truck and consider MPG..... when I bought my 2500 4x4 gssser, it wasn't even a consideration, I knew it would suck..
Good luck with your purchase, love my GMC.(seriously, not a dig)
Old 09-22-2020, 07:44 AM
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Cousin has several they run high mileage daily loaded with heavy chemical tanks. Consistently 15+ even maxed out. Mileage drops off towing, but hardly at all running the truck itself heavy.
Old 09-22-2020, 08:05 AM
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Your cousin is not being truthful. My company has several gm pickup trucks w/ regular body that make deliveries over 70 miles away and travel at highway speeds, never to exceed 68mph, have excess acceleration, or idle over 4 min as we track each vehicle. The 6.6 gets the same economy as our outgoing 6.0 trucks. Terrain is largely flat. All of our trucks have the 3.73 ratio. We've never had a fill up showing over 13 mpg. Always between 10.5 and 13

Old 09-22-2020, 08:27 AM
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Originally Posted by gotboostedvr6 View Post
Your cousin is not being truthful. My company has several gm pickup trucks w/ regular body that make deliveries over 70 miles away and travel at highway speeds, never to exceed 68mph, have excess acceleration, or idle over 4 min as we track each vehicle. The 6.6 gets the same economy as our outgoing 6.0 trucks. Terrain is largely flat. All of our trucks have the 3.73 ratio. We've never had a fill up showing over 13 mpg. Always between 10.5 and 13
His cousin probably had a diesel prior that got a magical 24+mpg.

Some folks are math people, some aren’t. It does amaze me the number of guys hung up on MPG on a boating site worried about vehicular mileage but get giddy if their boat approaches 1.5-2.0mpg at a cruise of 30-35mph. Makes zero sense.
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Old 09-22-2020, 08:30 AM
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Originally Posted by gotboostedvr6 View Post
Your cousin is not being truthful. My company has several gm pickup trucks w/ regular body that make deliveries over 70 miles away and travel at highway speeds, never to exceed 68mph, have excess acceleration, or idle over 4 min as we track each vehicle. The 6.6 gets the same economy as our outgoing 6.0 trucks. Terrain is largely flat. All of our trucks have the 3.73 ratio. We've never had a fill up showing over 13 mpg. Always between 10.5 and 13
what is the air drag factor on those trucks? Racks, work bodies, etc? I've personally owned a 6.0 truck, and hand calculated it did better than 13 other than when catching the wind due to a load. Wind resistance due to loads is a huge factor that is often overlooked. In their case, there is no added air drag at all, just weight.
Old 09-22-2020, 08:47 AM
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No real improvement over the 6.0..The newer trucks are heavier so the performance is similar....expect 12mpg around town and 14 on highway under 70
Old 09-22-2020, 08:50 AM
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Originally Posted by saltydog235 View Post
His cousin probably had a diesel prior that got a magical 24+mpg.

Some folks are math people, some aren’t. It does amaze me the number of guys hung up on MPG on a boating site worried about vehicular mileage but get giddy if their boat approaches 1.5-2.0mpg at a cruise of 30-35mph. Makes zero sense.
Range...

Makes a lot of sense actually.
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Old 09-22-2020, 12:51 PM
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They all come with big tanks, range isn't really an issue with 36 gallons, dunno..
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Old 09-22-2020, 01:11 PM
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Got one on Friday. I will let you know next week.
Old 09-22-2020, 01:19 PM
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Originally Posted by stetsonlaw View Post
Got one on Friday. I will let you know next week.
post pics or it did not happen.
Old 09-22-2020, 02:09 PM
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Originally Posted by stetsonlaw View Post
Got one on Friday. I will let you know next week.
what trim level?
Old 09-23-2020, 05:33 PM
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Originally Posted by WolpackVO View Post
No real improvement over the 6.0..The newer trucks are heavier so the performance is similar....expect 12mpg around town and 14 on highway under 70
this was my experience as well with a 6.0 crew cab long bed 4x4.. 4.10 rearend

I love a 6.0 engine, they are a work horse. But as someone else said, if your concerned about mileage, that isn't the truck for you.
Old 09-23-2020, 06:09 PM
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The new gas 6.6 is very disappointing engine. Underachieving power wise coupled with an outdated 6 speed transmission....if going gas the ford 7.3 is head and shoulders above it
Old 09-23-2020, 06:51 PM
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I agree with the 7.3 Godzilla engine. YouTube.com has some comparisons of the two vehicles.
Old 09-24-2020, 08:49 AM
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Originally Posted by WolpackVO View Post
The new gas 6.6 is very disappointing engine. Underachieving power wise coupled with an outdated 6 speed transmission....if going gas the ford 7.3 is head and shoulders above it
Wow? Have you driven one? It has great torque and response. My only complaint is no 8 or 10 speed trans. Power is great and IMHO an improvment. It fills the fleet truck slot well. Expect about the same mpg as the 6.0.
Old 09-24-2020, 09:01 AM
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Originally Posted by Bamaman View Post
I agree with the 7.3 Godzilla engine. YouTube.com has some comparisons of the two vehicles.

The Chevy towed MORE weight in the TFL Youtube video and got better mpg....
Old 09-24-2020, 10:13 AM
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Originally Posted by avalonandl View Post
Wow? Have you driven one? It has great torque and response. My only complaint is no 8 or 10 speed trans. Power is great and IMHO an improvment. It fills the fleet truck slot well. Expect about the same mpg as the 6.0.
have had one since October of 19, along with several 6.0s...
Old 09-24-2020, 10:58 AM
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Originally Posted by avalonandl View Post
The Chevy towed MORE weight in the TFL Youtube video and got better mpg....
I don't know which video you watched but the two I watched with the Ford and Chevrolet they both towed 16k on a 3/4 chassis. The Ford did it in 8:42 with 3:55 rear end at 2.2mpg and the Silverado with 3:73 was 11:53. I think the silverado would do a bit better with an 8 speed or better, however I the same could be said for going 3:73 or 4:30 gears with the 7.3. They are both new motors, but I think will both be reliable but I don't think it is completely a fair comparison... Maybe the 6.2 Ford with the 6.6 GM, I don't know.
Old 09-24-2020, 01:01 PM
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Originally Posted by avalonandl View Post
The Chevy towed MORE weight in the TFL Youtube video and got better mpg....
You might want to take another look at that. Identical trailers. The 7.3L blows the doors off the GM and RAM gas engines and it’s not even close.

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