Original oil and gas trade magazine vintage ad for WARREN PETROLEUM CORPORATION of Tulsa, OK. Does the summer heat take the pep out of your motor fuel, too? The Retained Volatility is The Answer. Blending Warren Natural Gasoline with your present high quality motor fuel will give it the Retained Volatility essential for Superior Performance. This unique 1955 old petroleum natural gasoline refining industry magazine advertisement would display fantastic when matted and framed. Approximate size 9 x 12 inches.