We have 3 vehicles as well. My wife commutes with the Chevy Cavalier, roughly 18 miles round trip, 5 days a week. I drove the Nissan truck until we purchased a used Subaru in January. We will average 15-20 thousand miles between the 3 in a year. It depends on how many trips we take and how far we go. We'll drive as many miles with the Elios but will get between 2-4X better mileage saving us plenty at the pump!