Good points, but first off where is this 25 mpg SUV and how many are out there? Second, where and how common are these additional three passengers to which you refer? Third, if you're going to use stats assuming people might be carpooling, then why can't the motorcyclist too; so 2 people on a 60 mpg bike is 120 pmpg and (is this SUV 5 passenger max?) 5 people in a 25 mpg SUV is 125 pmpg...1 person on a 60 mpg bike is 60 pmpg. 4 people in a 25 mpg SUV is 100 pmpg.