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 > 6.6 Chevy gas engine

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blt2ski

Kirkland, Wa

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Posted: 03/31/22 09:39pm Link  |  Quote  |  Print  |  Notify Moderator

Dude asked the same question last october. Göt the same answers too!
Oh he does bot come back either.
He may very well have traded.

Marty


92 Navistar dump truck, 7.3L 7 sp, 4.33 gears with a Detroit no spin
2014 Chevy 1500 Dual cab 4x4
92 Red-e-haul 12K equipment trailer

ksss

Eastern Idaho

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Posted: 03/31/22 10:46pm Link  |  Quote  |  Print  |  Notify Moderator

My brother just picked up his GMC Denali 3500 SRW, CC/SB with the 6.6 gas. Traveling across parts of Eastern North Dakota, we got 14-15 mpg on flat roads empty. This truck would need quite a tail wind to hit 20 mpg. Very nice pickup though.


2020 Chevy 3500 CC 4X4 DRW D/A
2013 Fuzion 342
2011 RZR Desert Tan
2012 Sea Doo GTX 155
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2015 Chevy Camaro ZL1

LanceRKeys

Amarillo, TX

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Posted: 04/05/22 06:09am Link  |  Quote  |  Print  |  Notify Moderator

ksss wrote:

My brother just picked up his GMC Denali 3500 SRW, CC/SB with the 6.6 gas. Traveling across parts of Eastern North Dakota, we got 14-15 mpg on flat roads empty. This truck would need quite a tail wind to hit 20 mpg. Very nice pickup though.


Note that the claimed 20mpg was with the cruise set below 60mph.

blt2ski

Kirkland, Wa

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Posted: 04/05/22 07:15am Link  |  Quote  |  Print  |  Notify Moderator

LanceRKeys wrote:

ksss wrote:

My brother just picked up his GMC Denali 3500 SRW, CC/SB with the 6.6 gas. Traveling across parts of Eastern North Dakota, we got 14-15 mpg on flat roads empty. This truck would need quite a tail wind to hit 20 mpg. Very nice pickup though.


Note that the claimed 20mpg was with the cruise set below 60mph.


Considering the 1500's with the same basic motor can get 21-22 mpg. IF some of the same options like 3.42 gears, 10 sp trans, cylinder shutoff were available options, 20 mpg should be doable on a long term level ground. Assuming you are not headed into a 15-20 mph headwind or other known hit to mpg.

My swag is this is not going to happen anytime soon in the over 8400 gvw 8 lug pickups.

Marty

Sjm9911

New Jersey

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Posted: 04/05/22 03:28pm Link  |  Quote  |  Print  |  Notify Moderator

blt2ski wrote:

LanceRKeys wrote:

ksss wrote:

My brother just picked up his GMC Denali 3500 SRW, CC/SB with the 6.6 gas. Traveling across parts of Eastern North Dakota, we got 14-15 mpg on flat roads empty. This truck would need quite a tail wind to hit 20 mpg. Very nice pickup though.


Note that the claimed 20mpg was with the cruise set below 60mph.


Considering the 1500's with the same basic motor can get 21-22 mpg. IF some of the same options like 3.42 gears, 10 sp trans, cylinder shutoff were available options, 20 mpg should be doable on a long term level ground. Assuming you are not headed into a 15-20 mph headwind or other known hit to mpg.

My swag is this is not going to happen anytime soon in the over 8400 gvw 8 lug pickups.

Marty

Its not a 1500 though, the bed is longer the height of the truck is way taller. It weighs more. I cant see it hitting that mph with the same basic motor.


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ksss

Eastern Idaho

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Posted: 04/05/22 07:19pm Link  |  Quote  |  Print  |  Notify Moderator

Sjm9911 wrote:

blt2ski wrote:

LanceRKeys wrote:

ksss wrote:

My brother just picked up his GMC Denali 3500 SRW, CC/SB with the 6.6 gas. Traveling across parts of Eastern North Dakota, we got 14-15 mpg on flat roads empty. This truck would need quite a tail wind to hit 20 mpg. Very nice pickup though.


Note that the claimed 20mpg was with the cruise set below 60mph.


Considering the 1500's with the same basic motor can get 21-22 mpg. IF some of the same options like 3.42 gears, 10 sp trans, cylinder shutoff were available options, 20 mpg should be doable on a long term level ground. Assuming you are not headed into a 15-20 mph headwind or other known hit to mpg.

My swag is this is not going to happen anytime soon in the over 8400 gvw 8 lug pickups.

Marty

Its not a 1500 though, the bed is longer the height of the truck is way taller. It weighs more. I cant see it hitting that mph with the same basic motor.


We had cruise set at 65, it was all two lane road, no Interstate. I don't see 20 mpg possible without going down hill and or a serious tail wind. We bucked some wind, and were down to 11-12 at times. There is way too much pickup there to get 20 mpg. It will be interesting to see what happens when they drop the 10 speed in it. Heck, if you could get a reliable 18 mpg, with an HD gas that would be a huge accomplishment. I really don't think that is possible from any HD gas engine from any OEM.

FishOnOne

The Great State of Texas

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Posted: 04/05/22 07:20pm Link  |  Quote  |  Print  |  Notify Moderator

I guy a work has one in a 2500 and he loves it when pulling his 29ft camper. He pulled that same camper for a couple of trips with his previous truck a 1500 5.3 engine and that was all he wanted.


'12 Ford Super Duty FX4 ELD CC 6.7 PSD 400HP 800ft/lbs
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