The local airport authority's surcharge on car rentals. About 13% applied to all rental charges including other taxes and fees. Easily circumvented by renting off airport area (e.g., downtown Vancouver). Cab ride there is $35 max.
Booked Thrifty off airport location. Much cheaper than Hertz on or off airport. I even tried some of the coupon codes and Thrifty regular rates beat them by a mile.
You are lucky. I've been looking into Thrifty for local rentals and they have generally been exorbitant for me.