2023 Chevy Silverado HD 6.6L Gas Vs 6.6L Duramax: What Is The Better Choice?

Today I compare a 2023 Chevrolet Silverado HD 6.6L Duramax to a 2023 Chevrolet Silverado HD 6.6L Gas!

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[oldcarcrazy]

With the price difference between the two, I've come to the conclusion that you can buy a lot of gas for $10k.

[matthewanderson]

So I have had both. I HAD a 2020 2500 Duramax and I currently have a 2022 2500 6.6 gas. Both were 4wd crew cabs with 20” wheels. So very similar trucks. My thoughts are:

1) there’s no comparison on power. But that’s a given. And also, the 6.6 gas is no slouch. Empty driving and 0-60 they are very similar.

2) my L5P got 2 mpg better in almost every scenario. 2 mpg better daily driving. 2 mpg better towing my 8.5’x24’ enclosed car trailer. And 3 mpg better on mostly interstate driving. Those numbers are 14-15 daily for the gas, 16-17 diesel, 8 towing for the gas, 10 diesel and 17 interstate for the gas, 20 for the diesel.

My final thoughts are I like them both. The diesel is another level as far as towing but again the gas does pretty good and I can maintain my speed limits towing, even on an 8% grade I have. Ultimately until the emissions nonsense gets more reliable and/or just goes away, I think I’m sticking with the gas trucks going forward. The upcoming 10 speed will be a big boost to the L8T towing steep grades too. Still won’t be diesel like but will be an improvement on something that’s already pretty good.

[NicholasA]

Keep in mind, the 2024 6.6 gas will get the 10 speed transmission now as well. That will make all the difference.

[PatrickAllison-zzgj]

I had a 22 gas, it got 18 highway, 16 county roads .the steering was loose and brakes were horrible, all my dealer would say was it's the new design. I towed 4 ton it was great, I really liked the engine, I traded it on Ram diesel. Diesel has ran $4.25 to $6.00, while gas $ 3.35 to 4.50 . Then def at $16 for 2.5 gallons, $200 for oil change, fuel filters . I wish I had kept it and sued the dealer to make right

[JacobWinkle]

I drove a 2021 3500 6.6 Gas, crew cab, long bed 4wd WT Z71 package. Towing a trailer almost 4k pounds with a 10k pound cat skid steer on it. No problems city or freeway, got 9.5MPG.
Drove from Cali to Glendale Arizona to pick up a cabinet for a customer and I mean unload, no trailer and just a Deck Tool box in the bed. I got 15.9MPG there and back. That was the best I could get out of it but I'd tell ya what, I was still going 70-80MPH on the freeway. If I remember correctly, I took the 15 North, 215, and then the 10 East to Arizona. Then I came back home to Oceanside California on the 8 Freeway, to the 805 and then the 5 North. I fueled up 1 time on the way back from Arizona to California. I was halfway to California when I fueled up. Had a quarter tank left.

[leespeyrer]

break in is about 5000 miles on the diesel and it does get better after that, using cruise control does help also

[brotherheed]

Showing the cargo capacity sticker. Big kudos.

[puzzlebow]

A good thing about loud diesels especially with the l5p are the cold starts!

[elcuh]

That 6.6 gasser is receiving the 10 speed tranny for 2024. Should help mpg and overall performance.

[johnhill]

Good review just put my order in for a 2024 hd 2500 gas midnight edition.

[austinmcfarland]

Anybody notice how both hoods at beginning didn’t completely close?

[ML-lgky]

Two different tools for different jobs.

[brandonmcfarland]

I Would Preferred The Duramax V8, But The Gas V8 Is Common Sense On Any Heavy Duty Pickup Truck 🚚.

[gregpiatek]

I have both, it's all about towing at this point, if you tow a lot get Diesel, if not so much gas is good enough, also if you tow local and you live in flat area you can get away with gas. If you tow far or leave in hilly area go with diesel, that gas have hard time going up hill or down hill with 14k pounds trailer.

[jamesvolpe]

I don't even have to watch the video, this is a no brainer Diesel hands down

[chriscota]

Acceleration test in the rain haha ehhhh. Honestly I am really interested In the reviews with the gas and 10 speed once the 24s come out.

[dhjengr]

I have the 24' Gas 2500. I'm not really a fan of the 10 speed. Coming from a 17' Tundra. With 10 gears the shifting is quick but there a lot of shifts if that's something you pay attention to. If you don't pay attention to it it's probably no issue. The downshifts from 60 to 0 just seems like a lot of down shifting and may actually reduce breaking distance in the transition to down shift. But I also had manual sports car so I pay attention.

[andiweave]

I have 22 duramax high country. I think it blows the gasser out of the water! But that performance comes at a price, like always.

[stewpuddy]

It's apples and oranges. If you tow a lot, buy a diesel. I bought the gasser as my truck is primarily for plowing snow.

[Uservbhgfde]

Gas engine i.e. L8T’s most of the power is suppressed by its big ass muffler that limits its flow drastically. Always and always upgrade the gas muffler to more free flow muffler like borla and see the difference. Once torque converter kicks in you can’t handle that power. Within couple seconds you’re doing 90mph. 50 to 90mph within couple seconds.