What I've learned of fuel efficiency is that is  good for the environment and it also saves you a lot of money.If our going to buy a new car you should make sure that is energy efficient, it may seem more expensive but it it will save you more money over time. You have to choose your car very carefully because theres a lot of cars that just waste energy.Also using energy efficient fuel  will helps the problems of pollution and global warming. Everyone should try to help the earth buy using energy efficient fuel.