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First, the Flotation sizing (looks like: 33x12.50R15LT) means the tires are built like LT type tires - which have a very low priority for rolling resistance. You would be better off with passenger car tires - ones that the size looks like: 225/75R15. Those will sometimes give good fuel economy, sometimes not. It depends on what you select.
To put it generally: Flotation and LT metrics are designed for "Trucks" and that means more attention to tread chip and chunking resistance, high unit loading (more load compared to the physical dimensions), etc. These thiungs are directionally away from good fuel economy.
So unless you are going to use your truck like a truck, you would be better off with passenger car tires.
And if your concern is gearing, why not select a larger passenger car tire - like a 235/75R15 (If they will fit!) Not only would the gearing be better, but directionally, this would be better for rolling resistance.
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