EPA Green car
 

The EPA has a green car rating that take the car FE and emissions and rates them. Unfortunately it only goes back to 2000 models. It interesting to look at how far emissions have come. Plug your car in there and see where you are at, if it's new enough. It would be nice to figure out a way to use actual FE instead of generic numbers from the EPA estimates or to find a way to find numbers on older cars.