The Mikoyan-Gurevich MiG-3 was a single seat, liquid cooled, Soviet fighter. It was designed to replace the older MiG-1. It had several modifications including a moved up engine and extra fuel capacity, which consisted of two tanks each containing 150 litres in the centre of the wing, a single 110 litre tank between the firewall and the cockpit, and a 235-litre tank below the cockpit floor. Even though the MiG-3 had not significantly improved over the MiG-1, it was still faster than the Bf 109.