Motorists continue to see gas prices climb higher. Baltimore residents can expect to see prices somewhere around $2.51 per gallon of regular unleaded gas, the AAA reported. Since the tail end of February, Maryland drivers have seen prices increase from around $2.30. A month ago Wednesday, a gallon of regular unleaded gas sold for only $2.17. The current $2.51 average is even higher when compared with last year?s average cost, which came to around $2.32 per gallon. As for the sale of crude oil, where refined gasoline comes from, the commodity sold at $58.70 per barrel.