(Reuters) -British supermarket group Morrisons said it has agreed a 2.5 billion-pound ($3.2 billion) deal to sell 337 petrol forecourts to Motor Fuel Group (MFG) and will use the proceeds to invest in its grocery offer and strengthen its capital structure. Both Morrisons, the UK’s fifth largest supermarket, and MFG are owned by U.S. private equity group Clayton, Dubilier & Rice (CD&R). The deal will also see MFG acquire more than 400 associated sites across the UK for Ultra-Rapid electric vehicle (EV) charging development, the two companies said on Tuesday. They will form a strategic partnersh…