[QUOTE="Whinging"] Well ok then. Scrap the buses that belch black smoke and can't be easily fixed, fit bio-diesel lumps into the ones that can and if nothing else buy spangly new ones.[/QUOTE] Ordinary diesel engines run just fine on biodiesel - just a lot cleaner. [QUOTE] Oh, and I don't want to pay for it.[/QUOTE] If anything, it'll save money longterm.