Hey dude, I filled my car up with shell V power (98RON), added a bottle of Valvoline injector cleaner to the tank, then took it to my mechanic for its annual tune up. I asked him if there was a way for him to tune it to make it more economical with this fuel, He managed to do it, since then, I'm getting about 600+kms per tank around the city. I have the over drive on, this seems to let the car run more freely when you are not accellerating. I also have the ECT button depressed, not sure if that really helps but its suppose to. I have also been experimenting with a higher tyre pressure of 36psi all round, I'll let you know if I find anything. Cheers, TORQUE