For the users of pre-prepared Bio-diesel , what is the cheapest you have found new veg oil and in what quantitys is it sold? I currently use Tescos own "pura" veg oil, at 59p per litre, but it only comes in 1 litre bottles so is a bit of a pain to refuel quickly ... I'm in the midlands if anyone knows anywhere that sells 25 litre drums cheap, as Makro etc is all about 78p a litre