I know I'm a broken record in these intro threads, but I'll strongly second (third?) the recommendation to get MPG instrumentation before spending time/money on mods.
You can go the Kiwi route, or pre-assembled MPGuino if you're comfortable discreetly splicing wires. Or a super inexpensive MPGuino kit if you're competant with a soldering iron & following instructions.
Or keep an eye on eBay for a ScanGauge. The older first versions have sold for as little as $50.
MPG instrumentation is a must have, IMO, if you're serious about improving fuel economy. It'll help both with your driving, and potentially to evaluate future mods you may do. Also, they're portable and re-sellable. Consider it a liquid, high return investment!
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