Allied had 60% of world manufacturing output, Germans were only capable of 17%. Soviets produced 1300 T34 tanks a month. Germany and supply issues- Rommel in El Alamein 1942 wanted 10,000 tons of petrol, promised 6,000, received 600. 1941 Germany was fighting war on 2 fronts with an annual oil allocation only 70% of Britain’s prewar domestic allocation. So in 1944 tactical flexibility was further hampered by inability to manoeuvre. Training time of the fighter pilots needed to protect the oil industry from allied bombing was curtailed for lack of fuel.