well, mobil's out of the race straight up, because it's only sold by a few outlets in capital cities. |blink|
do some road testing with the different fuels. my ex and i drove from ballina to coffs harbour, and used 3/4 tank of caltex vortex. we drove around coffs on holiday for a week to empty the tank, and filled up with optimax down there. we used 1/4 tank on the way back. caltex? :fuzz:
if you look into optimax, it's not that good either. its chemical composition doesn't allow it to mix very well with other oil-based substances, such as oil or other brands of petrol. so if you're stuck without a shell station and you fill up with something else, parts of the petrol separate and you end up with a clear goo in your entire fuel system. i've had mates who this has happened to
speak to any rotary enthusiast or person who uses 2 stroke (gokarters, dirtbikers) and they'll tell you how crap optimax is at mixing with 2 stroke oil mix, and how it's a good way to burn deposits onto the inside of your engine and end its life prematurely. optimax also has over double the minimum amount of ethanol than ultimate ;)
bp ultimate is the only epa-approved emissions reducing fuel in the country :(( it has the lowest ethanol reading of all petrols :blinks: it's able to be mixed with other fuels in an emergency :danger: bp are also australia's biggest pennzoil reseller, and i reckon pennzoil is one of the best oils in the world :dance: good brand names usually stick together
i'd stick with bp ultimate. a few BTUs more energy isn't going to make a difference if you're getting crap fuel economy or prematurely ending the life of your engine