[jkp1187]

Planning on taking a trip from Pittsburgh to visit Mammoth Cave, KY in the next few months, with a stop in on Charleston, WV on the way out and Columbus, OH on the way back.

Any suggestions on the most fuel-efficient routes?

I suspect sticking to the main interstates will make the most sense, but wanted to check to see if anyone had a better suggestion.

(Also open to suggested sights to see on the way out!)

Thanks.