Clearing out the far reaches of the garden shed I have come across a full 10-litre can of Diesel that I carried in the tintop before a holiday in northern Scotland in 2008. I need to get rid of it. I guess the local tip will have a method of disposal but, given that we were told a few years ago that Diesels can run on filtered chip fat, do you think it is safe to add, say, 2 litres at a time following each re-fuelling until it’s all gone? It would be mixed with the higher grade Diesel.