frankly it depend on your car, if your car oil hasn't been change or engine dirty even u put rocket fuel it wont do any difference, however if u did put on carburetor there abit of difference if injection it like u put petrol on a bicycle (coz the fuel is electronically control not manual), but for me better put the rm18 on fuel can get 10L of petrol (than 500ml of unknown liquid)
my best advise if want to save fuel, if your car is 10years, overhaul (either top or major) clean throttle body or carburetor, get the car tuned properly and buy good tyre (cleaner engine=better burning= save fuel)
i use yokohama, before use goodyear. yokohama give me comfortable ride, better handling and save abit of fuel
p/s: clean your trunk, of un needed junk, then if have roof rack take it off and use only if needed, n spoiler take tht off if you not going more thn 200kmh, i will just slow u n give more weight and drag to car,
hope tht help u
Bump: oh forgot the fuel injector cleaner are no good, the best way to clean is to take it off, beside ur car are running everyday tht fuel injector hard to get dirty, wht u need to clean is the carb coz tht will get dirty faster tht injector, there are other brand like stop oil, x1r n few more
Bump: oh forgot the fuel injector cleaner are no good, the best way to clean is to take it off, beside ur car are running everyday tht fuel injector hard to get dirty, wht u need to clean is the carb coz tht will get dirty faster tht injector, there are other brand like stop oil, x1r n few more