The Aztek, introduced as a 2001 model, is an SUV based on the Montana minivan. Like the Montana, it uses GM's 3.4-liter, 185-hp V6, which is neither sprightly nor fuel-efficient. The Aztek is clearly aimed at the much-hyped active lifestyle crowd, with handy standard and optional features like removable plastic storage boxes, a removable center-console cooler, a slide-out cargo tray, and a tent that fits onto the rear of the vehicle. Negatives include poor rear visibility, clumsy handling, a stiff ride, a rear seat that's too low, no rear wiper, and a split rear gate that's awkward to operate.