You may be in for a surprise at the pump today.

It's not a pleasant one though because gas prices are expected to increase to at least $3.65 for a gallon of regular.

That's according to gasbuddy.com which says that this could reflect a hike of nearly 35-cents for some stations in Ohio as well as others in Michigan, Indiana, and Kentucy.

A senior petrolium analyst says the rise is baffling - even to him - given the drop in oil prices.