Too high an octane WILL slow you down. In addition to preventing pre- ignition, higher octane fuels burn slower and more completely. Too much octane for the amount of compression or boost, and the fuel can’t burn completely and thus can’t give off all of the potential energy. See any race fuel site such as Sunoco, VP or Howell for more details.
Our vehicles can benefit from about a 50/50 blend of 93 and 110 or 112 unleaded IF using a SC or NOS - the computer can and does adjust for this.
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