In the midsize Station wagon category, the Mercedes Benz E63 AMG S 4matix averages 15.63 L/100km while the Toyota Prius v averages 6.71 L/100km. Convert these fuel economies to miles per gallon.

Answer 1

first, invert them
100km/6.71 liters*3.78541Liters/USGallon * .62miles/km

100/6.71*3.79*1/3.78*.62 miles/gallon
100*3.79*.62/3.78 mi/gal

Answer 2

use your standard conversion factors for

gal/L and mi/km