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…With plenty of fuel pump and injector, we deduced that the low-pressure problem was actually caused by the ‘Stang’s tank literally being low on 93-octane fuel. The empty tank gave us a perfect opportunity to proceed using Shell’s new URT Advanced race gas. The URT Advanced is the latest in high-octane (116) unleaded fuels that actually performs as though it contains lead, and by doing so, provides great performance through its ability to protect engines against detonation under high-timing advance/high-boost. With the 79mm pulley and Brent working from the same custom 93-octane tune, timing was advanced to 23 degrees with the Shell fuel.