i'll go with Randy because he's been around as long as dinasaur.
my question is how do you determine if 55 works for every cars and especially modern cars? where exactly does aerodynamic comes into play for 18wheelers and for prius for example? i say start with 18wheelers. too many of them on the roads. then there's traffic congestions each days for each cities. that's gotta count for something. how do you solve that without going broke.