In reply to simon_D:
I ran an XGK for decades on unleaded or Parafinn. But now using Aspen 4T with a omnifuel. 4T is more expensive than unleaded, but it burns much cleaner and is alot cheaper than Coleman fuel.
Downsides of Aspen 4T are that not many places stock it, and you have to buy in 5 Litre cans. I generally buy 15 litres in one go as its a bit cheaper in bulk.
But keeps me going for a couple of years, and means I no longer stand at the petrol station trying to fill up a < 1 litre bottle after filling the car without spilling or getting caught by the pump attendant! Or try to fill from a car spare petrol can, which are crap at pouring.