One of my most memorable stories as a motoring writer was back in 1989 when I was on the staff of Practical Classics and colleague Chris Graham and I tested a tin-based ‘device’ which, apparently, had been developed during WW2 and would, the makers claimed, allow any leaded-only car to use unleaded petrol without further modification. It was also said to deliver significant economy and emission benefits. The product was called Carbonflo.
Testing Carbonflo was Chris’s idea, and it was certainly topical. Unleaded petrol had just gone
