hi there i was parking up at the supermarket the other day next to a guy in a n reg land drover diesel. he had a trolley full of tescooooo 2ltr vegetable oil bottles and was pouring them in his landdrover. i asked him how it runs on it and he said fine get more miles per gallon than diesel and at 40 p litre he said alot cheaper. so i asked him yes but what about the engine and he said well id drink vegetable oil but not diesel so cant do any harm hey . . he drove off ok he did say the older disels run ok on it . so has any one else seen this at tescccccos? , will it carbon up the engine ? will it harm engine in long run ? ive heard of it before but not seen it . love to hear from any one tried it