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A few thoughts:
1. Based on my previous experience with a Ranger, this 2.3L engine REALLY likes full synthetic oil. It makes a noticeable difference in fuel efficiency. My favorite was Mobil1 5w30.
2. Swapping the engine fan/clutch setup for an electric cooling fan properly set inside a fan shroud makes a noticeable difference in fuel economy and power available at the rear wheels.
3. Any weight reduction in things that spin will reduce the power that it takes to get your truck moving. Lighter tires, wheels, aluminum driveshaft swap, etc would all be beneficial.
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