i use the same vehicle cept mines a fieldman, asda is cheaper at 36p a ltr, if your going to use it get a couple of spare fuel filters ready, start slowly, say 1 gallon to a tankfull then go to a max of 50/50, i do that with the occasional straight diesel , worth adding injector cleaner on occasion as well, prob find veg will lift every bit of muck and crud from your tank and lines a drop the lot in your filter - normal, run it unchanged for a week or so, though keep the spare and the tools in the trak, if it starts slowing down and loosing grunt change the filter, if not change it after two weeks, the more veg in the mix the starting gets a bit harder, more heater plugs works, i hit mine 3/4 times at the moment, personally i feel mine runs quieter and no noticable loss of power, your allowed 2500ltr of veg or similar per year without paying duty on it, though you must keep a log in the vehicle of when you added it and how much, i think you need to keep the reciepts as well, even if you mix at 25 veg 75 diesel your still going to save around 30p per litre which is considerable