He was already going 60-65. He just admitted to going 70-80 on the freeway; and, given the other cars, the speed limit is probably 60.
I love speed as much as the next guy; but this was a review that, as far as I could gather, was CNN's version of peer reviewing the Time's article... and finding it wanting. A normal person isn't taking their car to the track. TopGear already did that test on an even more suited car. If you were testing the range of a Bugatti Veyron to see if it was useful as a commuter car, would you go flat out the whole way? Or, more realistically, if you were testing a Subaru WRX STi, or an Evo X, for its "normal driving conditions" range, would you be keeping your revs at 4-5k the whole way?