2003 Sierra with 8.1 liter 345 HP and
Alison Auto. Plenty of power for towing.
A little hestitant on take off when
cold. 20,000 miles in 6 months and it
runs like day 1. Fuel mileage is
absolutely HORRENDOUS!!!! Towing an
enclosed race car trailer x-country avg.
mileage = 7.95.
Driving enmpty no load at all avg.
mileage = 12.98.
The Isuzu engine is the best part of this truck, along with the Allison tranny. The worst part has been all the GM stuff. Everything from numerous AC problems to leaks, memory features deleting themselves, multiple transfer case problems for auto 4WD, and leaking fuel injectors. If it were not for the dealership's attitude and incompetance i would buy again.
I bought this truck as a replacement
for my 96' 1500 as I needed more
muscle to tow a 5th wheel trailer.
The 8.1L has plenty of punch, but I
struggled with traction on anything
less than dry hard surfaces. I have
already experienced the typical
Chevy/GMC parking light burn out on
one side that they can't seem to fix
and I have had numerous fuel indicator
malfunctions. The fuel consumption is
killing me and towing or not is not
much difference. Ready to look for an
older/smaller model again!