Discover flexible travel options for your family at Dollar Car Rental - Thornhill, On, Ca DLE at 398 Steeles Avenue West, Thornhill, ON, L4J 6X3 , Canada. Learn how you can save up to 15% off the base rate by pre-paying for your rental car.Get premium rentals without the premium price tag with Dollar’s Prestige Collection — perfect for a getaway, business trip or family vacation.