National Emerald allows automatic upgrade from a midsize to a full size via the Emerald Aisle program. Basically, as a member, you could reserve a midsize car and go to the rental locations and pick out any of the car that is in the Emerald Aisle. Most of the time, the cars in the Emerald Aisle are full size cars, and up to a basic SUV model.

Also, use the entertainment coupons for free weekend days, and you could save a bunch of money.