BALTIMORE (WJZ) — The cost of gas is up across the country, including in Maryland, and is inching toward the highest price in three years. Gas is going up about a penny every other day — 15 cents in the past month. “We’ll be paying the highest prices for this time of year since 2014,” said Christine Delise with AAA. Gas companies are changing over to a different summer blend. To do so, some refineries shut down, leading to the classic market principal of supply and demand. A tighter supply means they can demand more for your fuel. Demand is...