I have various machines that run on petrol, so I wondered what exactly a tank full is.
Looking at Wynne’s site, 1ml treats 1 litre, so the bottle in question will treat 250 litres.
That works out at roughly 5p/litre, depending on where you buy it from. ECP are charging £1 more than Wynne’s price, which isn’t surprising.
I think I will put 97 octane petrol in, saves a lot of messing around for not a lot of gain.