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65+ Vehicle modifications for better fuel economy - EcoModder.com
That will take you to the list of mods that are discussed around here. I'd say a good place to start is with a ScanGauge, UltraGauge, or MPGuino. That would help you zero in on your vehicles most efficient speed in a particular gear, as well as help you iron things out as you change your driving habits.
JMac
