Sean T. -
If I were on the West-Side here in LA, I think I would have the same MPG problem (today I am driving into that "MPG Blackhole"). Red has the same issue in his Honda Insight. I can't remember your driving context. Do you have lots of short trips?
If you can't afford a scangauge, then maybe a vacuum gauge would be a good start.
For good MPG, I think the running assumption is that the car is in good working order. That's a universal FE tip. If you ain't got the skillzz to do it yourself, maybe a community college car maintenance course would help.
CarloSW2
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