Two things happen when the guy sitting next to me floors the gas pedal of his $2.7 million car. First, the raspy growl of the 1,817-horsepower engine mutates from that of a cornered wolf to something even more feral and dangerous. It’s a roar fueled by so much gasoline that, at top speed, the vehicle could travel only about fifteen miles before needing a refill. Second, as we rocket past 100 miles per hour, the combination of speed and unrelenting acceleration sucks the scenery along both sides of the test track into a blurred tunnel of green, as if the Millennium Falcon has just engaged its hyperdrive in a field west of Houston.At 170 mph, just about three seconds later, the far end of the…