We purchased a 2006 Interstate about six months ago and have put about 12,000 miles on it. Initial impression was that suspension was rather soft, so took it to Upscale Automotive for suspension upgrades and now it handles excellent. Also had tuning module and high flow air filter installed. Road weight is 8350# and we get between 21 and 25 mpg depending on terrain, wind and if we are running the AC (we live in Arizona).
AZtraveler
