On Sun, 28 Nov 2004 04:03:47 GMT, "K-town"
<jdu52580@carolina.stopspam.rr.com> wrote:

>Hello,
>
> Not being an engine expert, I figured I'd throw this question out to
>this NG.

What makes you think we are experts? We just have computers and
internet connections.

> I have a 1990 Civic LX, 1.5L DPFI 5-speed, and usually I put
>regular unleaded (87 octane) in it.

It is my understanding that using a higher octane than is called for
in the owner's manual is a waste of money. Modern engines are designed
to adjust the spark advance so as to avoid the "octane ping" that was
common with older engines.

On the other hand, it is true that some manufacturers claim the higher
octane gasoline ("premium grades") contains additives that may help
clean your injectors. You have to treat these claims the way you treat
all marketing claims.



Elliot Richmond
Freelance Science Writer and Editor