It took a whole week this time, but Chillicothe's gas prices are back to their recent rising ways again. On Monday night (Feb. 11), regular unleaded leapt by $0.08 per gallon, from $3.39 (the price such had moved to last Monday, Feb. 4) to $3.47. Gas prices have gone up a total of $0.54 per gallon in 25 days (since Jan. 18) without a decrease.