That was my first thought too. I ran the numbers based on the summary and a 12k mi/yr average. With a car that gets 30 mpg, the annual tax comes to $74. With a car that gets 35 mpg, the tax is $63.43. With the distance based tax, the new rate is $120 or $240 per annum with the 1 and 2 cent/mi levies, respectively.

As a hypothesis, if the distance from 0 to 1 is half a wavelength, the distance from 1 to 4 is 3/2 wavelengths and the distance from 1 to 6 is 5/2 wavelengths. These distances represent the first 3 resonances of a resonant dipole antenna. In the case of an antenna, perfect would mean capturing all of the resonances and thus be optimal.