Quote:
Originally Posted by Dcarver
Anyway I'm averaging about 16mpg combined and its tuned up properly, tires inflated to max sidewall...
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You can inflate your tires considerably more than the sidewall rating. For example, if the sidewall rating is 28, you can easily inflate to 40 PSI. You can expect better FE from over-inflation, but also a much harder ride.
As was implied, getting a scan gauge won't automatically produce better FE. It will give you information presented in real time, some of which might be useful. Changing your driving habits often comes down to keeping your foot off the gas and off the brakes as much as possible. But when in traffic it's not always possible, and there is only so much you can do.