Just park on Level 7 of the Gantry, the ramp up is behind Pad 2. It's completely FREE !
The parking lot has 26,000 spaces, plus you get a free valet and courtesy bottle of Dom Perignon on arrival.
Also, if you'd like your car personally delivered 5 minutes before the end of the game (to beat the queue out of the sports village), that can be arranged free of charge.
Surprises me that only a few people use it!