Regarding figuring out how much the miles are worth from the tax-

I did this for a Hertz rental at SFO about a month or so ago. I did the math on the amount of the tax and calculated that they are valuing the awarded miles at 1.5 cents each.

Whether or not that means Hertz is paying 1.5 cents for the miles, I don't know. But since the "how much are miles worth?" topic is a very much discussed topic on Flyertalk, I thought it interesting that Hertz values them at 1.5 cents each.