I have only had my 2003 WRX for about a month but have tried different types of petrol and I had a spare bottle of Aldon Octane booster in the garage so tried this in recommended dose with 95 octane fuel, mainly just to use it up as had been on the shelf for a couple of years, I noticed that it did about 3 miles to the gallon better why would this be is it a better octane than using BP ultimate or total SUL, as have tried both those, I don't know if I should buy some more as the car seems to like it, anyone else used this additive.