Quote "Similarly, running 9.1 kilograms of ground-up tyres through the Hawk-10 produces 4.54 litres of diesel oil, 1.42 cubic metres of combustible gas, 1 kg of steel and 3.40 kg of carbon black, Meddick says."
4.54 litres is 1 imperial gallon. So now we can work out how many old tyres we need for a tank full. Having seen the video it looks as if they need to make a very much bigger machine to make commercial quantities of diesel.