On Fri, 15 Apr 2005 19:09:09 -0400, Douglas Dou
<douglas_dou@yahoo.com> wrote:

>Thanks for the link. The link essentially says that 87 in pump station
>is the same thing as 91 recommended in manual.

No. If the manual says 91 is suitable, then that's the octane that
will give you the most power. If economy is more important to you than
performance, then you can use 87.

>Can't understand why
>Honda does not put 87 in it since the cars are sold in America.

The reason is compression ratio. If you have a high enough compression
ratio, then 91 octane is able to give you more power. If you want
economy, the knock sensor will dial back your ignition advance, you
will have less power, but better fuel econmy.