Diesel prices between Genoa and Malaysia
Contact the guys at Yacht Fuel Services in the UK, they have agreements and supply fuel for all of your route, give them your places of choice that you want to bunker and the amount and they can advise you if it is a good place to take on fuel or not and the prices. Sometimes you won´t get prices confirmed too far out, but they will advise you on this. Their tel number is+44 870 608 2124. Their website is www.yachtfuel.com
These guys are professional bunkering agents and not cowboys, they have been around for years and I have used them all over the world. You could well find out that bunkering without an agent is expensive and almost impossible in dodgy places and the quality could be dubious, not what you are after on your long passage is it!