If I am buying a car solely on its limited impact on climate change, which car should I buy?

*
10 points
Mini Cooper Convertible (31 miles per gallon of gas)
Bugati Chiron (10 miles per gallon of gas)
Toyota Prius (56 miles per gallon of gas)
Hyundai Ioniq Blue (59 miles per gallon of gas)

( NOTE: THIS IS A SCOOL QUESTION AND I NEED HELP!!!!)

The best car to buy for its limited impact on climate change would be the Hyundai Ioniq Blue, as it has the highest miles per gallon of gas at 59.