My old B4 Passat had the 1Z engine and loved fresh veggie oil. It had an 80l tank so I would buy 3 x 20l jugs of fresh oil from Costco for 55p/litre and fill it up, then top up with about 10l of diesel (which was about £1.30/litre at the time).
Ran smoother and quieter. 55+mpg. Smelt great. Only issue was in sub-zero temps when it would take a few extra seconds to start.
Only sold it because I accidentally bought an E36 320i Touring.
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