Pleanty of power for towing or what ever work you might need it to do...The
highway mileage empty is about 14 to 15 at best. Towing a travel trailer
won't drop that down much though, if the trailer isn't huge, you'll get
around 11 mpg.
This is too broad a statement to really be accurate. While the 6.0 is
a good motor, it has its limitations. When determining its towing
abilty you must factor in its towing abilty by the terrain and trailer
type you plan to tow. A 4.10 should be considered the minimum axle
ratio you want and do not waste time with a 3.73 as contray to populat
belief you will not gain any MPG with it towing or not with OD. Also
it is quite possible to pull a 30 foot plus trailer with one IF it is
properly geared. With aftermarket 4.56, it will tow a heavy load quite
well. Up untill 2000 in old body style trucks GM offered a 4.56 in 350
and 454 powered trucks but they dropped it in new body style to make
the Dmax and 8.1 more atractive and profitable. ALso, you must
consider tire size too for if you plan to run oversized tires, this
reduces your effect axle ratio and towing power and you need to regear
to get it back as no magic chip, exhaust or airfilter will restore
it.. One more thing, staring in 06, GM offered a Allision option with
the 6.0 which would give you a deeper first geat (3.1 vs 2.48) and a
reveerse gear that is more than twice as deep as in the 4L80 that
comes with 6.0 by default. One final comment, the 6.0 pulls a LOT
better on 89 octane or better fuel as 87 is not enough as the ECM
retards the spark before you here the knock which reducing pulling
power and MPG when it is working hard.
Had the 6.0L in my first '02 2500HD w/ 4.10 rear in it. It pulled our 32'
fifth-wheel OK. Couldn't keep it in OD with the AC on even on flats. Tranny
never got hot, but it just didn't have the torque. It did OK climbing the
mountains in TN. There were times it liked to drop clear back to second when
only rolling around 55 MPH and hitting a good hill. Ended up moving up to an
8.1L w/ 4.10 in another '02 2500HD. This move was partly for the engine and
also for the long box, a short box is a waste of space, and then decided
while going that far to just get the crew to be set for many years to come.
The 8.1L w/ 4x4 gets right around 11 MPG city/hwy and towing drops to
anywhere between 8 and 10 MPG. If you won't be towing anything large, the
6.0L will git 'er done and be easier on your wallet!
I have an 6.0 03 1500HD crew cab and a love it. I don't pull anything too heavy just a four place trailer with atvs. I get about 14-16 mpg hwy on 87 octane. She got some power with a power programmer though
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