It's solely for track cars and not road cars.
To get any benefit you need the car set up to run on 102 Octane rated fuel. I'll stick with Tesco's 99 Ron super for 98p a litre thanks.
Nick
Jesus, Tescos round our way charge 98p for normal unleaded, i think their super is over a Quid

. Interestingly if I travel to Salisbury about 15 miles away it's 5p a litre cheaper for everything.
How do they get away with it, robbing bast£*&s