Most car dealerships will tell you the estimated highway and city mileage a vehicle gets, but if you want to figure it out for yourself, you will need to determine how many gallons of gas are in the car, and calculate the miles per gallon based on the amount of miles that amount of fuel takes you.
A great site to see lists of most and least fuel efficient cars is fueleconomy.gov. Here you can compare and contrast the MPG between different vehicles as well as see which car is rated the best for MPG.
85.6 mpg
Vw
Pris
Currently, the 2010 Toyota Prius - 50 city / 49 hwy mpg
The best car models with the best MPG for 2013 you can find at a trustworthy car dealership near you. Ask and you shall recieve. Your car dealership person will gladly answer your questions and concerns.
The domestic automobile gets the best MPG is the Chevy Volt by far. This vehicle is primarily an electric car and is said to get in excess of 100 mpg.
The series that has the best mpg is the Volkswagen Passat TDI at 42.9 miles per gallon. The second closest best car for miles per gallon is the Mazda 3i Grand Touring at 42.5 mpg.
the best ive ever found and had was my dubed out 1986 toyota corolla 5spd it got 56 mpg high way and 52 city
There are many efficient cars out on the market today. The best MPG car you can buy at the moment is the 2012 Smart For two Coupe at $347/MPG. Coming in next is the 2012 Nissan Versa Manual at $366/MPG.
These lists exist mostly online. http://www.fueleconomy.gov/feg/best/bestworstnf.shtml is the best but http://usnews.rankingsandreviews.com/cars-trucks/rankings/Affordable-Midsize-Cars/ lists them by car type.
If you are looking for more information on Which hybrid cars are the best as far as MPG, the best place to find your information is on www.fueleconomy.gov/feg/hybrid_sbs_cars.shtml