eli5: Why does changing tires to a larger size make my truck gas mileage go down?
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If by larger tyres you mean a bigger circumference then you will actually be travelling faster and further than your Speedo is showing. Your Speedo will be calibrated based on the tyre size when the truck was sold. A larger diameter wheel and tyre will actually travel more distance for a single revolution and so you are actually travelling faster and further than you think. This could add 5% to the distance so when the Speedo says you have done 100 miles then you have actually done 105 miles. Download a GPS speed app to your phone and check it against your Speedo at different speeds.
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