Hybrid Taxis at Sea-Tac
Ten of the taxis serving Sea-Tac Airport are gas-electric hybrids and the number will grow to 25 by the end of the month.
The Port of Seattle has required some older taxis to be replaced with the fuel-efficient cars.
More details here.
Speaking from experience, the Prius can easily and comfortably accommodate 3 to 4 passengers with quite a bit of luggage. It's a good choice for cab drivers.