True performance mods will not increase your economy, although they will increase your efficiency. Confused yet? Good!
In all seriousness - "performance" mods are geared toward high-RPM performance. Anything you can do to get more power from your engine without introducing more fuel, or increasing pumping losses, in the RPM range that you're normally operating with, will increase your economy. I.E. Any kind of engine load that ISN'T moving the car. Such as the alternator.
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