I have Dollar "Fastlane". As I board the shuttle bus I inform the driver I am a "Fastlane" member. He then checks the "Fastlane" list for my reservation, when we reach the car pick up area the shuttle driver tells me which isle to take my car from. Usually there aren't any compacts so I end up with a free upgrade. Whole thing from bus to driving off the lot in my rental car takes about 15 minutes.
My car rental is from Tuesday morning to Saturday morning because I am leaving Las Vegas early Saturday and flying to Reno for Hot August Nights... Total estimated cost of the car rental is $84.00

Scott