i think its like what fabian said it depends on which engine
I have been a loyal shell user to the extend that mati mati also must put shell eventhough running on fumes...until I accidentally used projet, straight away I could feel the difference and Ive been using it since (i have also tried others but cant feel as what I feel using projet)
but in my wifes Kembara and lately the Avanzza using projet the car very sluggish to the extend that I curi curi put projet my wife can immedietly tell that i put projet but on shell lain cerita :dunno: