[cleanspeed1]

Dude, if you are getting that kind of mpg in your car right now, don't you dare touch it.

Just get a Scangauge and drive better.

I had a 2004 Elantra and the cruise rpm was too high for me. Used it for courier work and was bought new. The ratios were good in the city, but bad on the highway, at least to me.

I would max out the car as it sits with what you have first, then go next level on the hardware when you can't go further. Work on aerodynamic improvement, weight reduction. Change the tires to low rolling resistance style ( the best ones will give a big jump in mpg ). Synthetics in everything.

That car sounds like it's where it needs to be for right now.