For me, the only two meters I pay attention to would be the price at the pump and the odometer in the car. So long as I get 370 local miles or better per every 40 to 43 liters fill-up the only variable is the cost.

What I find missing in the argument for metered road usage is every vehicle registered has a maximum weight allowance. So if they know the number of vehicles plus the maximum weight each is capable of carrying, then it shouldn't be too difficult to determine road wear based on traffic flow monitoring and adjust gas pricing accordingly.

Now there are some who would argue it's not fair to charge a large, cumbersome vehicle the same price for small, fuel efficient roadster. However, one fails to recognize the fact the price for gas is based on the weight factors of those large, cumbersome vehicles ... the small, fuel efficient roadsters are basically paying far more in fuel taxes than the damage the incur in the environment and and on the pavement.

To put it another way, to take my little two-seater roaster, with about 100-hp engine, on a roadtrip from Trier, Germany to Salzburg, Austria isn't going to crate the same level of road wear an 18-wheeler, a van, a pickup truck or a large sedan would along the same route.

In my opinion, there's a silent issue involving breaking road usage into categories based on vehicle type as an extra revenue resource ... maximizing their resource potential at the public's expense, perhaps?