I still don't believe the 5.3L is going to have 355 hp. It isn't underpowered as it is, but I don't think it is going that high. That is what the 6.0L (+ ?) versions are for.

Also, I will be happily surprised if the 4.2L I6 is indeed the base engine. Like others, I thought the 4.3L might be around again... I've been out of the loop quite a bit lately, though, so anything is possible...

BTW, based on the volumes involved, I would not be surprised if only some of the engines got the six speed autos right away (like the bigger engines, for example). The six speed is brand new for '06 in the limited volume Corvette, STS-V, and XLR-V. The new SUVs are coming online just before the pickups. I would expect the 4 speed to be on some of the lower end trucks/engines to start with, rather than a sudden increase from ~40k 6 speed autos/year to 1.2 million per year a half a model year later...

If that is the case (and I'd bet money on it), some of these fuel economy numbers (if they are even the real thing) could very well be for 4 speed trannies. In which case, we could expect another bump up when the 6 speeds become fully available across all engines and trucks.

 

Notice there is a 5.3L and a 5.3L H.O.

The 6.0L is going to be 400hp/400tq

 

This is what I was referencing.

 

I belive that this is the case also. James the GMI guy who is posting a lot of info confirmed it in a 70+ page thread.

 

Thank you, This makes me very happy! I'm looking to upgrade to a new Avalance when they come out but I want mileage to go with it. If the 6 speed is available later this will make things much better for my justification for doing so. I need this mileage because I'm putting on 1K a week right now on my Impala!!!

 

not really a 5.3l gets 16-20 on a 2006 18/22 MPG
i guess its just a couple but its better then toyotas tundra's 4.something v8 15-18...

 

i was told by a customer, who i think was missinformed but, he said he read that GM was gonna put Cat Diesels in the trucks? has anyone heard anything about this? I havent heard anything And I was under the impression Durmax was the engine for the silverado.

please advise

 

Are you kidding? These are great mileage figures. 19/23 from a full size SUV with a 4.8L V8 engine is an awesome mileage number. It's better than the mileage number of a Lexus GS400, which has a smaller (arguably less powerful if you use the same SAE standard, though we'll never know), less powerful engine, is much lighter, and has much better aero. It's even better than a Suzuki Grand Vitara V6, which is a much smaller, less powerful SUV.

 

Why is the mileage for the 6.0 tahoe and 6.0 silverado so different?

 

1k per week?!

Anyway, I'm just speculating, so don't take it as gospel. Plus, it isn't like a six speed auto is going to make the fuel economy jump from 22 mpg hwy to 30 mpg hwy. But still, even a 1 to 2 mpg improvement is laudible and helpful (especially at 1k miles per week, dang!).



NewbieWar,

RE: Cat engines.

I've never heard a peep about Cats being available in the pickups. You can, however, currently order a Cat (C7, I believe) in the Medium Duty trucks (commercial type trucks). Perhaps that is what your friend is talking about? Note the engine options in that link. The Duramax 7800 (a 7.8L, inline 6 cylinder diesel) and the Caterpillar C7 are the available diesels. If you click back to the C4500 and C5500, the familiar Duramax 6.6L (V8) from the pickups is available.

EDIT: Just reread your post and realized that you are a Chevy salesman, so you probably know everything I just typed. But no, I haven't heard of the C7 making its way into the pickups.

 

THe Silverado 4.8L gets better milage than any V6 midsize or fullsize truck on the market.

Avalanche with 4.8L V8 = 18/23 MPG (probably the same as a Silverado) vs. Honda Ridgeline V6 = 16 / 21

 

The SUV is quite a bit heaver dude.

 

GS400? As in my car? That car/motor came out 8 years ago, not that it was ever intended to get good gas milage anyway. But FWIW I get 26 highway, 21 city. The GS430 that's out today is about to be replaced by the GS460 and GS450H. The 460 is just a 4.6L V8 making 350+ hp SAEII, the 450H is a 3.5L V6 borrowed from the incoming IS350 and derived from the GS300's 3.0. The motor itself is producing 306hp SAEII in the IS350... the GS450H will be piggy-backing a hybrid electric system onto the motor for some nice power gains as well as fuel economy gains.

Regardless, I never said GM trucks are gas hogs anyway... I used to own a 2000 Silverado, albeit it was a 4.3L V6, but I got very respectable milage out of it (21 or so average with about 70% highway). I'm just saying that the gains in milage over the previous gen were not as great as I was hoping given the two major additional technologies.

 

Cat wants to kill Allisons in sales is their goal (Engine/Tranny) packages. I highly doubt GM will purchase their "Competitions" engines in the light truck market. The bigger trucks I'm not sure about...

 

For anyone griping about the lack of gains here (which I can't believe anyone would be so foolish as to complain, then again...we are talking about this board ), consider an '06 Torrent AWD is EPA rated 18/23. 185hp, 3,600 lbs.

A new Tahoe 6.0 4x4 with OVER TWICE THE POWER, and certainly weighing a minimum 1,000 lbs more, will be rated 16/20. Or a 350 or so HP 5.3 with only twice the power roughly is rated at 17/21. Again, what's the problem here?

Bravo, GM Powertrain