The truck has a lot of room for improvements. For example, you could get benefits even from forced induction, as it would allow you to keep lower RPM while cruising.
BTW since you already looked at fiberglass for a bed cover, have you never considered one of those single-piece front clips used in off-road racing trucks for weight reduction? Those can be also had a little aerodynamically-enhanced, and that would be good for the mileage in highway.
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