Volvos and chip fat
No experience, but.. I'd say the first consideration is access to a ready supply of the fat! If this is guaranteed then it has to be worthwhile, but not of course in a petrol engined car. Changing an engine is not an economic or practicable proposition for most, so that means changing to a diesel engined one. There are kits which allow use of straight veg oil or you can have a go at manufacturing biodiesel, which can be used in any vehicle, as long as it's expendable.
If you want to keep your car the alternative is an lpg conversion, which is considerably less green, but is certainly economically worthwhile if you do a lot of miles.
There is a fair bit of info on this site about both options and a member (mike brace) does lpg professionally. There are loads of sites with info on biodiesel and you can go to classes to learn how to make the stuff. It would suit someone with access to the oil and some knowledge of basic chemistry and plumbing!
john
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