You'll never get 35mpg. The best I ever got in my wagon was 27mpg. I averaged 24mpg and I kept detailed milage records. At 24mpg you're getting about as good as your going to get for and over all average. You might be able to raise the average a mile or two but thats about it. Make sure your tires are inflated properly and your alignment is correct, your valves are adjusted, rebuild/replace the injectors, and all the filters are fresh. The tires themselves can make a difference as well. Make sure you've go good quality tires.

A couple mods you could to to reduce the drag of the car would be to build rear wheel covers that fill in the wheel well, and remove one or both the side mirrors. Legally you probably have to have a driver's side one, but I'm not sure.

You have to realize too that a sedan weighs slighty less than a wagon so milage can be slightly higher.

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