Why not just base the taxes on mileage at your yearly registration renewal. No need for GPS chips, and monitoring.
Based on one of the proposals in the article, ¼cent/mile, 15,000 mile/yr average drivers would pay $37.50.
Based on Colorado gas tax of 40.4c/gal, I pay $6.06 when I fill up with 15 gal, up to $315/yr based on fill-up once a week.
I think the mileage based tax would be better (And gas tax repealed), because the proceeds are to be used for road maintenance. Both efficient, and inefficient vehicle cause similar stresses and "impact" to the roads, irregardless of fuel efficiency. Therefore they should be taxed the same (based on vehicle class, by GVWR).
Even if they did a full cent/mile, I would still be paying about half of what I do now in gas tax. Doing an odometer check at yearly registration, would be easy, and the infrastructure is already in place to collect money at the DMV. No need for elaborate GPS chips, and taxing/gas stations.
I am ONLY in favor of this if :
a. The gas tax would be repealed
b. No need for monitoring devices, especially based on Speed, Location, Congestion, or anything else which has no basis for road repair spending projects.