What a difference a week can make. Just last Friday, Chillicothe regular unleaded gasoline prices were at their lowest point in almost two years, at $2.93 per gallon. On Monday, the C-T reported that those prices had risen up to $2.99 per gallon, and yesterday (Thursday, Jan. 24), gas prices jumped up another $0.10, to $3.09 per gallon. That makes for a $0.16 hike in gasoline prices in a mere seven days time.