If a car has a high gas mileage is it more energy efficient?

Is a vehicle that has 27.5 gas mileage more energy efficient that a car with 13.5 gas mileage?


And does having a higher gas mileage save more gasoline?|||Absolutely. The more miles per gallon a car gets, the less gas it will use on each trip.|||that or the car has a very low vehicle weight and does not have to use much fuel to move it. look at the geo metro, a very small car getting around 50 mpg.