www.fueleconomy.gov
You can check out the mpg for whatever car your looking at to see if it gets good miles per gallon. I feel safer in my Ford full size pick-up. I've seen aftermath pictures of head on collisions between a Porsche and a full-size Chevy pick-up. The truck had a large dent in the bumper and the Porsche was unrecognizable as something that was once a car.