Any driving around right now will cost you after the latest jump at the pump. Gas prices in Evansville jumped almost 20 cents overnight. A gallon of regular unleaded will cost you as much as $3.15. In Henderson, drivers are paying the cheapest, but thats still $3.09 a gallon. Gas prices in Illinois are holding at $3.22 a gallon. Analysts say the price for regular unleaded could top off at $4.00 per gallon by summertime. Some motorists say the high prices at the pump may keep them indoors this summer.