JONESBORO, Ark. (KAIT) – A nearly 9-cent increase at the gas pump ahead of the Christmas holiday could leave Arkansas motorists saying, “Bah! Humbug!”. Average gasoline prices in the Natural State jumped 8.7 last week to $2.63 a gallon, according to GasBuddy.com’s survey of 1,826 stations. That’s 2.2…