In the subcompact category, the Hyundai Accent takes the crown, getting 41 mpg combined (33 city/48 highway) with the manual transmission and 39 mpg combined (36 city/41 highway) with the CVT.
For larger vehicles, the Toyota Sienna is the most efficient minivan, achieving 36 mpg combined (36 city/36 highway) with its hybrid setup. The Kia Niro plug-in hybrid crossover gets an impressive 101 MPGe (46 miles of electric range).