I just got my registration completed finally. The sticker is sitting on my counter. I'd love to know where we can go charge for free that this charging infra money is going to, because I have yet to find anything. I think what that $20 goes to is the state incentive for businesses installing charging stations. They can get a pretty big incentive towards the cost of the charging stations. I do not believe it requires that in turn they offer free charging. The building I work in just did this and they charge $2/hour on the L2's. They have 4 charging ports and no one uses them because they are $2/hour and everyone already pays a ridiculous amount to park monthly. Also, I think I am the only LEAF, everyone else has Tesla's so they probably don't care.
Also, for reference, it was $875 to register my 2017 LEAF SL in Arapahoe County. Considering I paid about nothing for the car it was painful. I drive the equivalent of an economy compact car but get taxed like I am driving an Audi.
You can itemize the tax though, so that's a bonus.