The Model X might be the greenest—and fastest—way to tote up to seven people over hill and dale. Models are designated by battery capacity and performance, ranging from 75D to P100D; EPA-rated range spans from 238 to 295 miles. A P90D we tested went from zero to 60 mph in 3.3 seconds, and Tesla claims a P100D can do it in 2.9. The X is actually practical, with all-wheel drive, a high-tech cabin, and striking but fussy Falcon Wing doors. This Tesla X features the optional Autopilot semi-autonomous driving.