Just by looking, the Intrepid looks pretty good aerodynamically, I've always wondered what would be possible in terms of FE with them. I assume they must glide very well so it might be worth while trying it out with some P&G and see what you get.
Do you have a specific MPG goal or just trying to save money? My neon is rated at 30mpg highway and you can see below that I smoke that just with tire pressure and techniques. Unless you drive alot you probably won't be saving money after buying something else. Especially if you can get 35mpg out of your car.
Ian
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