I have a 2006
I have a 2006 SS trailblazer it gets about 14 miles to the gallon. It is stock but isnt slow considering what it is (a SUV).
They make a 2 wheel drive and a all wheel drive mine is all wheel drive.
Lets see problems.....Tore front diff out trying to do burn outs,door panel inserts pop out, 20 inch tires wear out at 16000 miles cant remember anything else really going wrong with it.
Its not a bad vehicle but I might trade it for a SRT Jeep.