Back to the main menu. Bit the bullet and picked “Install Tune”. BOOM, another menu popped up: Economy Tune? Nah, need more juice. Tow Tune? Could be useful, but still… Performance Tune? YES PLEASE! Hit “Performance Tune”. Then saw numbers: 87 Octane, 89, 91. I usually put 87 regular stuff in it. Took a gamble and bumped it up to the 91 Tune. Tuner flashed a warning: “Use Premiu...