ive been using amoco ultimate in my 04 accord should i switch to regular??

"K-town" <jdu52580@carolina.stopspam.rr.com> wrote in message
news6cqd.7794$Mu3.802926@twister.southeast.rr.co m...
> Hello,
>
> Not being an engine expert, I figured I'd throw this question out to
> this NG. I have a 1990 Civic LX, 1.5L DPFI 5-speed, and usually I put
> regular unleaded (87 octane) in it. Every once in awhile I'll put
> mid-grade (89 octane) or premium (92 or 93 octane) in it because I heard
> that doing so will keep your injectors clean. (Is that true?) Once I
> really splurged and put 100 octane fuel in it (only 5 gallons) and it did
> run pretty good. One thing I noticed, is that if I run premium (93) in it
> several tanks in a row, it will actually not run quite as good. It's a
> very minuscule difference, but I can tell there is a slight decrease in
> performance. If I drop it back down to mid-grade or even back to regular
> on the next tank, it seems to go back to running better. Is this all in
> my head, or is it possible to have an "octane overkill" on such a small
> 4-cylinder engine?
>
> Thanx in advance,
>
> Jonathan
>