City and Highway Mileage?

I've graduated high school two weeks and as well as got my first car, 2015 Ford Fiesta. I was looking up mileage about my car and stumbled across city and highway mileage.

My car is up to 31 city, 43 highway. What does that mean? As well as the difference between the two.

Stop and go driving (city) will use more gas and get less miles per gallon

While both numbers are a guestimate and may not be accurate in YOUR driving conditions, they let you compare the fuel economy of different vehicles.

There are 2 different tests they do.
City is driving at ~30 mph, with lots of stops and starts. This uses more fuel (less mpg)
Highway is driving steady at ~60 mph, and usually gets better fuel economy than stop start driving.

It doesn't mean YOU will get those exact numbers, but it lets you compare vehicles. If you compare your Fiesta to a big SUV that gets 15 / 20 mpg in the standard tests, it's safe to assume you will only use 1/2 the fuel, and you are still ahead of my Toyota that gets 25/30

City means you'll get around that mileage driving around the city and highway, you'll get that mileage driving on the highway.

City is stop and go so you will get less mileage since your accelerating more often.

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