Kia has a reputation for producing fuel-efficient vehicles, and many of its models have received high ratings for their fuel economy. For example, the Kia Niro hybrid SUV has a fuel efficiency rating of up to 52 miles per gallon in the city and up to 49 miles per gallon on the highway, depending on the specific model and trim level. The Kia Optima sedan also has a good fuel efficiency rating, with some models achieving up to 37 miles per gallon in the city and up to 46 miles per gallon on the highway.