Thank you all for the advice. Looking at the tires again, I realized deejaaa was right. One is a P245/70R16 and the other was a LT245/75R16. The construction differences alone would make up the weight.
I'll definitely look into other ways I can make up for some of the inefficiencies of this truck. An aero cap and electric fans look like they would have better results than tires.
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