I get the same or better mileage with the 6.0 compared to the 4.8, so that debunks your theory.

I don't see GM using a V8 as a base engine though. I'm surprised as it is that they even put a V8 in it!

 

Ok big guy.

 

I don't want to argue with you, you are obviously very knowledgeable. With fuel economy being as critical as ever now, you would think GM would put the 4.8 over the 5.3 if it had any significant advantage in fuel economy. I never saw good gas mileage with the 4.8, and read many reports of people doing better with the bigger engine.

 

Just so I can initiate a pissing match, my RCSB 2wd '04 silverado with a 4.8L and 5spd got me 24.1 MPG with 3.73 gears on the interstate driving from Blanchard, OK to Minneapolis, MN. Picked the truck up brand new off the lot with only 6 miles on the odo and drove non stop back to Minneapolis at 75-80 MPH.

 

Haha hirdlej.

 

Then what are you going to do, race a Cobra?

 

Tearin him a new *** again? lol

 

The lack of torque with the 4.8L wouldn't be a problem in the Colorado with it being so light. The 4.8L gets very good milage in the right size vehicle.

 

I'd have to agree the 6 liter would return almost the same fuel economy as the 4.8 would if they were identically set up. I would be shocked if there was more than 2mpg difference between them in any identical test situations. You could throw a 3.42 gear in with the 6L and make up the mileage difference and still have way better performance than the 4.8.

Now if you're talking day to day driving and you pound on it, you will see a difference between them, but nothing more than 2-3 mpg. And to me personally the brute force of the 6.0 is way worth the fuel loss.

 

OMG! RC Colorado with a 5.3! That would be so AWESOME! Either way the new EC & CC are going to be burnout machines!