"The Celica is an 18-year-old car on 14-year-old tyres," he said. "When I missed a shift at the bottom I thought I might be in trouble. So I pushed it hard for the rest of the run."
That strategy worked, and he despatched the course in just 51.50 - closely followed by SuperQuad maniac Ian Ffitch 53.31 and Steve Murphy, who managed 53.56 in his 650hp, V8-powered Mitsubishi Cordia.
But the Shootout was just icing on the cake for the spectators at the three-day event.
The event's purpose is more to showcase the more than 100 vehicles, ranging from incredibly rare vintage bikes and racers through to fire-breathing hillclimbers, rally cars and even a McLaren F1 car.
Millen drove his Celica, Tundra race truck and a restored RX3; Clark Proctor raced his 1973 March 73A and his 1973 Targa Escort; Paul Sundberg drove a Ferrari F40 and a 1932 Alfa Romeo 8C Monza; visiting luminary Juan Fangio Jnr will be driving a 1958 F/J Fiat. One of the real surprises of the weekend was the immensely crowd-pleasing Ann Thomson in her 14-litre 1906 Durroq - who was fittingly awarded for an impressive performance in the challenging machine.
For more on the Leadfoot Festival see next Saturday's issue of Driven.