From Inside Automotive-- These guys were first to call BS to MTBE. You modern car with a computer will run fine on 87. Your manufacture has advertised a HP and milage figure that was obtained using 93 . So they must recommend using 93. They have tested most performance cars on 87 and it's about a 10 hp drop. You will never know it. They say run 87 and don't switch around often so your computer is not constantly trying to adjust..