We pay about $5/imperial gallon here - there is about a twenty percent difference, I believe, in this gallon versus the one in the U.S. So we pay perhaps $4 per U.S. gallon and it has to be brought in. Britains high rates would really bug me if I lived there because England has the big oil field.
I will seriously consider converting the AVL 350 to diesel when the engine starts wearing out. The Chinese clones of the Yamaha diesel seem to be very good and, having read conversion details on the web, it all seems fairly straight forward to convert. They use the same trany, just replace the engine and engine mounting system. But our speed limit in Tonga is only a little over 40 mph and, it is a pleasant enough speed to drive at given road conditions and the short distances traveled.
Producing copra for coconut oil used to be one of the largest industries here. There was a guy here a few years back trying to sell a newly invented machine for extracting the oil, getting a very pure product. There are still a lot of coconut trees here, although many are being cut down and shipped to Japan as timber (sound familiar?). You used to be able to buy a gunnysack full of copra (dried coconut meat) for just a couple dollars, U.S., but I don't know how much oil you'd get out of a bag.