Yikes. That is a little to low for summer mileage. In addition to what other folks may recommend I would suggest the following:

- Check your tire pressure. Many folks have it set at the maximum listed on the tire... some prefer to have it at 2-4 psi below the max listed. Ensuring proper inflation reduces road resistance and provides dramatic increases in fuel economy.
- Check out this article and this one too.
- Do read through the awesome advice in this forum.
- Avoid an aggressive driving profile and service the vehicle at the dealership according to Toyota's recommendations.
- And finally, consider a low viscosity motor oil like a 0w20.


Cheers;

MSantos