I booked a Full Size car thru Costco Travel with Budget for my Vegas trip 4/21-4/24. I got a good rate of $70.26 total for the 3 days. My question is, on the terms and conditions it says "Offer valid for a one-time, one-car group upgrade on a Compact through a Full size four-door car. Maximum upgrade to a Premium." "Free upgrade will be applied at time of rental." Does this mean I have a Full size reserved and will be upgraded to a Premium or is my rate for a Mid size and I'll be upgraded to a Full size? Thanks!