Tire pressure.

Here is a long list, grouped by approximate cost:
http://honda.lioness.googlepages.com/gasmileagetips

A lot of this one would do in the course of a normal tuneup.
You do not know exactly where the car is in its maintenance,
so if you have the bucks, you might next want to start with
a tuneup.

<septicman@peoplepc.com> wrote
> My 93 EX automatic has over 200K miles on it, I am recent
> nth. owner,
> car runs perfectly but only gets low 30's with careful
> suburban
> driving.
>
> Based on experience, what one item would you suggest
> replacing that
> can have an immediate positive impact on fuel economy?
>
> Thanks in advance !