Yeah, diesel is more expensive per litre here than petrol, a cleverly thought out intentional price hike to make diesel a similar cost per mile, but the advantage of the diesel engine is you don't
have to use the stuff at the pumps that they refer to as diesel (Rudolf Diesel used things like peanut oil in his development stage)...

With an engine such as the Merc W123 300D, old VW engines, most Isuzu engines (which GM used over here until they decided to use their own), all can run on anything from old engine oil to used Canola (or for us brits, Rapeseed oil, same stuff, just a different name) without any modifications, and of course when you refine vegetable oils or even animal fats into Biodiesel, you can use it in more modern engines with relatively few modifications, though you do have to ensure they're compatible with Bio as it can eat away at rubber seals and hoses (see Top Gear & their 24 hour endurance race in a diesel BMW which isn't bio compatible!!), which ends up with a dead car...
Of course, there are cheaper fuels which will work great, but governments will frown upon (often resulting in fines and possibly worse), paraffin being one of them, there's nothing wrong with it, but it's that most of the time there's no fuel duty paid on it and therefore, s'not allowed...

Still, if I ever somehow manage to ever afford to be able to drive, I'd definitely buy a diesel car as a daily driver, though I wouldn't know what as yet cos I have no need to think of what I'd buy, but it'd probably be a Honda Accord (Euro, sold as an Acura across the pond) tourer...
