If ever a term could be considered relative, when it comes to a discussion of the best fuel-efficient trucks, the numbers you’ll find pale in comparison to the best fuel-efficient cars out there. Of course trucks are heavier, and called upon to perform more demanding tasks than cars (in a lot of cases), so quite naturally their fuel efficiency will be lower. Further, trucks are held to a lower fuel economy standard than cars. Thus, those 30s and 40s you see on EPA stickers for the best cars are stratospheric compared to the numbers you’ll see on trucks. Still, pickup trucks have come a long way from back in the day. With but two exceptions, today’s best fuel-efficient trucks combined fuel economy ratings average in the 20s.