10.5 to 1 - WOW! Thats surprising. In that case the Accord could definately benefit from higher octane. Are you sure about that Ratio? The LS2 Corvette is only a little higher (10.9:1) and it beats my LS1 Z28 (10:1). If you run either of those cars (Corvette or Camaro) on anything less than 93 your mileage craps out and the performance bogs.

Interesting!