my brother has started to try mixing his diesel with cooking oil.... only this is in a 1.5 diesl metro lol. the test dummy car. he is mixing it 50% diesel - 50% cooking oil, so far it has run ok. obviously it will take a little for any problems to arrise, so we'll let you know.

p.s. the only down-side at the minute is the car makes you hungry... all you can smell is the chip shop!!! lol