I had a 01 Chev swb ls with the 327 engine.. Probably in my opinion the best V8 engine in production, because it will go 300,000 plus if well takin care of, and parts for it can be found anywhere, and they don't break the bank like the imports.
This 06 is even better, I bought from Car Maxt after the other one was totaled in a hail storm. So I have been driving the 327 for 13 years total. At the time of purchase had 93,000 miles. Never been in the shop after 3 years of ownership. Had two emission issues, that chev avalanche club helped me fix, Great multi purpose vehicle. gas mileage could be better, averages only 13 in town, but highway miles good as high as 19.
From daily driving to camping, atving, snowmobiling, RV pulling, grocery runs, hardware, and landscaping hauling. The kids love the rear seat DVD player, and the wife likes the heated seats in the winter. My favorite is the OnStar that now allows me to contact my wife as soon as I get back to the truck after a day snowmobiling instead of an hour later when I get within cell range.
This is hands down the nicest vehicle I have ever been lucky enough to own. It is the best of all worlds for me, large enough to haul my labs and hunting gear with locking compartments and also pull my trailer. Far more flexibility than my Silverado, Blazer, or Corvette!
This is my second Avalanche I have owned. I will NEVER own another truck except the Av. Very Stylish, Eye catching, versatile. Used for camping, tailgating, towing, moving large items, and much more. My original was a 2002 which I thought was great, and the 2006 is even better. I totalled my 2002 in an accident which I hit in, and realized in any car and many trucks, I would not have made it out alive. VERY SAFE!!! Fuel economy is not bad for the size of the truck, but it should be expected with its size and capacity.
I run my truck pretty hard high speed and for long periods and over the years I have averaged over 17 mpg highway and city combined, I have even pulled small trailers and the gas mileage was still good, I'm going to purchase another Avalanche soon this will make my third one and am very satisfied with the overall performance.