Originally Posted by
Troy Buenger
The 5.4 may have better grunt off the line, but most of my towing is at highway speeds. At highway speeds the 5.4 just would struggle to maintain speeds. Matter of fact when pulling the same loads I couldn't even run my truck in overdrive, in fact most time it would never even shift in overdrive even when it was selected, and as a result the 5.4 had worse fuel economy than the 6.0 which could tow the same load in overdrive. The fuel economy of these two trucks pulling the same load was the 5.4 ~ 9mpg and the 6.0 ~ 11mpg.
That's interesting, was the rear end gearing the same between the 6.0 and your 5.4?
Of course the new 6.2 will have more horsepower as well as torque than the Chevy 6.0, I'd be very curious to see how their torque curves compare. Maybe the LY6 engine does a bit better down low than I thought...