WASHINGTON, D.C.—Following earlier claims by Undersecretary of War Robert Patterson that the priority given to synthetic oil is threatening the air war, Rubber Director William M. Jeffers yesterday demanded an immediate investigation . Pattern claims the summer air war in Europe will be hampered unless production of aviation fuel is increased, which could lead to a longer war or even a stalemate. Additionally, he claims fuel shortages in March and April have forced some planes to be held on the ground. Williams specifically asserts that priority allowed to Jeffers for construction of synthetic rubber plants resulted in the current fuel situation, asserting that there is “…barely time…” to correct the problem. This spat between rubber production and aviation-fuel production has been on-going.