Hello fellow DERV owners!!! Since having my 2.0TDI PD170, i've always used BP Ultimate or Shell V-Power Diesel I don't really know why, seeing as it's around 5p more expensive than regular diesel. I think i've convinced myself that they give me more miles per tank and are better for my engine I know that it's not likely to give me any real performance increases by using this fuel (very minimal, if any), so why am i really using it? Anyone a bit more clued up on these fuels? Anyone else use them?