Have you guys felt the difference with a new oil change? Well this specific gas station that i fill 91 (premium unleaded), FX seems to have more high end torque/horsepower over 60-130mph. I have pumped shell into the blood of the FX for years but lately ive been filling up this specific gas station from time to time and feel the difference right away. Also the car consumes less gas and high mph increase (than any other shell). Very interesting.