Just the usual. Monitor your right foot, drive at slower speeds, run a properly inflated street tire, anticipate more = brake less.
The price of a mod to save gas must be compared to how much gas it will save. Most info re: CAIs is hype.
Things you can & should do regularly at recommended intervals: keep engine tuned up, (spark plugs AND wires, dist cap & rotor), change engine oil to synthetic, change air filter, change fuel filter, change tranny/transfer-case/diff fluids to synthetic.
Some will argue with the above.
YMMV - get it? -heh-