I read this from Hyatt Goldpassport site:

As a Hyatt Gold PassportŪ member, you can earn or redeem points for car rentals. Earn 300 Gold Passport bonus points when you rent a car from AvisŪ or Sixt Rent-A-CarŪ simply by presenting your Gold Passport membership card at time of rental. Or, redeem 6,000 Gold Passport points for a one-day intermediate-size car rental by calling 1-800-228-3360.

Have any of you tried? My company forbids me from paying extra for the airline miles, I wonder if this bonus requires additional fee or not? I also wonder if we actually need some coupon code to make this happen (not specified on the Hyatt website).