I own a 2015 Ford Focus SE, and although the owner's manual recommends 87 octane, max power figures are quoted at 93 octane (maybe because the compression ratio is 12 to 1?) I normally run 87 octane, but wondered if I should run 93 now that the temperature is over 100. The car runs perfect with 87 but I wondered if 93 would be better when it's over 100 degrees, to prevent pre-detonation, and especially with higher AC loads. Thanks for your input!