6.6 Chevy gas engine

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.

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.

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.

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

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.

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.

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

Grit dog wrote:
Fish, you won the bet!

Yep... I wasn't too far off.

I have a 2020 Silverado 2500, CC, 4x4, short bed, 6.6 gas. Tow a small Grand Design toy hauler @8400 lbs with no toy in it. It’s 12’6” tall and have gotten as little as 6 mpg towing against a head wind to 9 under good conditions. Empty with flat ground, no headwind, cruise control under 60 it will get 20 mph. These conditions are rare, but it will do it. Haven’t been in any real mountains, but towed in north central Alabama and it did fine.

Yes, but do you tow with a 6.6 gas?