Power for the 2007 Chevrolet Tahoe comes from one of two more powerful engines. The smaller of the two is a 4.8-liter V8 with 290 horsepower, representing a five horsepower gain over the 2006 model. For more power, buyers will want to opt for the 5.3-liter V8 with 320 horsepower, which amounts to 25 ponies more than last year. That small-block V8 continues to feature GM’s Displacement-on-Demand cylinder deactivation system, and with the redesigned Tahoe’s improved drag coefficient, EPA combined fuel economy is expected to rate 20.5 mpg on two-wheel-drive trucks and 20.1 mpg on four-wheel-drive units. That’s up from combined ratings of 16-17 mpg for 2006 models.