Thats BS if I would tell you to use 87 or 89 or 93 octane.....
The only one who can find out is you:
Get 87 octane gas and drive your car on a warm, dry day, AC on.
Cruise for about 5 minutes (on interstate what so ever) and then put the hammer all down.
If you hear engine ping, which actually sounds more like someone ratteling with a bounch of keys below the hood, betwen 4000 and 5000 RPM @ WOT you know that you would be better off with higher octane gas.
Check that out and you'll know!