New to the Amex Plat card and its respective CDP number with Hertz and upgrades. I currently have a reservation at SAT on an upcoming Saturday afternoon for a day and I reserved a Mustang since it was only about $28. The full and green options were only a few dollars cheaper. If I changed my booking to one of those, would I still get an upgrade opportunity? If so, would the typical upgrade be to a premium category? It seems like I should just keep my current res since $28 seems like a very good rate. Sorry for the noob questions. The Plat CDP number makes my rental about $1-2 more expensive than a few others, but the 4 hour grace is a God-send for me for this rental. And yes I have registered for #1 gold status even tho everyone on the planet gets that status.