The experience gained in 1964 and 1965 allowed the 7-liter Mk II to dominate the following year. In February, the GT40 again won at Daytona. This was the first year Daytona was run in the 24 Hour format and Mk II's finished 1st, 2nd, and 3rd. In March, at the 1966 12 Hours of Sebring, GT40s again took all three top finishes, with the X-1 Roadster first, a Mk II taking second, and a Mk I in third. Then in June, at the 24 Hours of Le Mans, the GT40 achieved yet another 1–2–3 result.