This is a great truck. I thought about getting a regular pickup but instead went with the Avalanche and am so glad I did. The midgate is an amazing and useful feature. It's incredibly versatile. The abiltiy to lock the bed is priceless. Definitely the best truck I've driven and with out a doubt most practical for day to day use. As for gas mileage, though it is kind of a hog the active fuel management makes a huge difference and the instant fuel economy display is a great way to help alter your driving to conserve fuel.
My favorite feature is the ability to lock the bed. It opens up such a wide range of things to put in it that couldn't go in a regular pick up