***...replace state revenue being lost due to a more frequent use of high miles per gallon vehicles. ****
LOL! It bit them in the butt again, like the city that wanted voluntary reduction in water use in a drought, then demanded a raise in water rates to make up for the loss of water use.
happened here in San Diego ....twice
Same happened with conservation on electricity. Then they turn around and add a surcharge to make up for the loss.