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Does your truck have a belt-driven engine cooling fan? If you do plan on doing some city driving and want to do something with greater impact at low speeds, consider replacing that with an electric one. I spent about $100 for a Proform fan and Imperial fan controller (Both from Advance Auto's website, returnable to stores). I'm seeing a 1-2mpg improvement in my 1993 Ranger, plus the fringe benefits of quieter operation, quicker heat-up (feels good in January), and smoother acceleration.
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