That's close to "as good as it gets" with a 2003 Pilot.
As texases suggests, dose it with Techron, check tire pressure, and stay in the speed limit---and avoid using AC if you can. That's about it.
If you haven't changed your air filter in a long, long time, and if it was really clogged, that might help, too, to change that for a new one.
But even all these suggestions only might lead to minor gains---driving habits is the biggest factor.