As mentioned above, I tow with the 4.3. I have a CC 4X4 standard bed and 3.42. My truck is rated to pull 7k lbs and my trailer has a GVWR of 7k lbs. If you stay within the specifications of your truck (including payload) and use a proper hitch system, you will have a good towing experience. Of course, this applies to all engine sizes. My experiences pulling my TT have all been positive. I've driven through mountainous terrain and heavy freeway traffic. Gas mileage is impacted when towing with the V6 or the V8. Speeding with a sail behind you is the biggest culprit for sucking gas. Driving between 55 -60 mph keeps my mpg's well in the double digits. The Ecotec 4.3 V6 is a very strong and capable engine. The fact that more powerful engines are available does not negate this fact.