3 illustrates an approximate linear correlation between the butene content n the feed and the RON of the hydrogenated product. The more butene there is in the feed to the catalytic olefin condensation unit, the higher will be the RON of the hydrogenated product and the better the product will be as a paraffinic component of the gasoline pool. Because of the absence of olefins and aromatics, this product meetsor exceeds all current environmental regulations.