Originally Posted by
Bossarb
Also I don't know how if you choose the "Auto Upgrade" option under Manage Booking you can know in advance how many miles it would take out of your account to do that upgrade, which seems like an important piece of missing information!
There is a mileage calculator on the website. Enter your information and you should see a table showing miles required for the different ticket types.
ETA. The Auto Upgrade feature is reported to be less reliable than regularly checking yourself, or via Expert Flyer, and then upgrading.