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Yeah, like FrankLee's comment suggests, it sounds like something's wrong with it. Is the compression ok in all the cylinders? Do you drive like a maniac? Is it full time 4 wheel drive? Do you have an ultra-low rear-end ratio? Are you sure your odometer is correct?
How far is your commute to school, and what kinds of speeds do you go (freeway, surface streets, ??)
Because, if it's mostly highway speeds, slowing down and improving aerodynamics should help the most... air dam and/or grille block, etc. You say covering the bed isn't an option. Are you sure? Even one that opens or removes easily? If you do much highway speed driving, that could make a big difference.
But if it's mostly slow stop & go, then lightening the overall weight and learning to coast up to the lights & overall hypermiling techniques will probably help the most.
Airing up the tires as much as you dare, lighter weight motor oil & tranny fluid should help in both cases. Replacing the mechanical fan with a thermostatically controlled electric one should help, too.
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