I am utterly damned tired of being snooped on by psychopaths and bullies. Where I am located right now and where I have been is not the business of government thugs and snitches.

The "mileage tax" also does not encourage economy.

Well, by 2020 there may be a lot more non-gas vehicles on the road not paying any fuel taxes.  Gotta get their fare share somehow. 

Of course they will not institute a mileage tax INSTEAD of a fuel tax.  They will do both.

If they are dumb enough to use GPS, it will spawn an industry of GPS jammers and decoys.

 Time to develope new hacks and jammers.