My wife and I bought an '06 GMC Envoy with the 5.3 liter motor brand-new, and have been pleased with the truck, but not GM or the three dealer's I've taken it to for service and other questions - but thats a topic for another discussion group.
When my wife and I bought it we specifically looked for a V-8 engine and towing package - this included the 3.73 axle
ratio. It is a really nice truck, both for towing and commuting to and from work. In the summer I get 18 - 19 MPG, and in the winter MPG is about 3 MPG less. Towing our Scamp
we get around 15 MPG at 55 MPH, and 1 MPG less for every 5 MPH higher speed. It has towed our Scamp
16 without any issues of any kind in all kinds of weather and terrain.
If you have any questions about your Trailblazer, join the folks at www.trailvoy.com
. They are not quite as 'polished' as the nice folks here, but I have found a lot of good information about my truck on the site.
-- Dan Meyer