Ohio drivers are paying 40 cents more per gallon at the gas pump compared with one week ago. The average price for a gallon of regular gas is $3.86 in Monday’s survey from Auto Club AAA, the Oil Price Information Service and Wright Express. That’s up from about $3.46 last week. In Zanesville gas is selling for as high at $3.89 a gallon for regular. The Ohio AAA has attributed the sharp increase to multiple problems at Great Lakes Refineries that bumped up wholesale prices for the region. The AAA said prices may continue to rise until they are resolved. A year ago, the average in Ohio was $3.86. Nationally, the average price for regular gas is about $3.62, about 13 cents higher than last week. The national average last year at this time was $3.69.