The greenest car is certainly no surprise - the Toyota Prius that gets 53 MPG in the city. And the worst? The Ford F350, a massive truck getting only 11 MPG in the city. Granted, those in the market for buying a truck are probably more concerned with how many cement blocks the bed can hold than how many miles per gallon it gets. Or so the commercials would have us believe.
If you're not in the market for new car, GreenerCars.org has tips on simple behavioral changes that can save gas. Honestly most are just good driving etiquette anyway, such as avoiding putting the pedal to the floor coming off a stop. Driving behaviors can influence how much pollution your car directly emits. According to the website, the same volume of carbon monoxide is produced from a mere one-second of high powered driving as is produced with thirty minutes of normal driving. For those not familiar with this chemical compound, it's poisonous.
Before you get back in the car, take a look at the list. Sometimes its the smallest things that make the biggest differences.