Horsepower has never been an Explorer strong point, but with 292 ponies galloping out of the 2006 model’s optional 4.6-liter V8 engine, it finally delivers the kind of oomph that a truck weighing well over two tons requires. Featuring variable cam timing and 24-valve cylinder heads, this is the same V8 found under the hood of the Mustang GT. In the 2006 Explorer, the V8 makes 300 lb.-ft. of torque at 3,750 rpm, and drives either the rear or all four wheels through a new six-speed automatic transmission. Ford says that fuel economy is improved by 10 percent despite the 53-horsepower gain, but we averaged a middling 13.2 mpg during our drive on mountainous two-lane highways, small-town streets, and forest trails. If fuel economy is a concern, stick with the standard 4.0-liter V6, carried over from last year but modified for smoother operation and lower emissions. Ford says the V6 emits 74-percent fewer smog-forming pollutants than last year, allowing the engine to meet stringent Ultra Low Emission Vehicle II (ULEV-II) standards, making it more environmentally responsible than the Honda Accord Hybrid. The V6 can’t tow and haul as much as the V8 though, with just 210 horsepower generated at 5,100 rpm and 254 lb.-ft. of torque on tap at 3,700 rpm. Ford mates a five-speed automatic to the Explorer’s V6.