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Rear axle gear ratio for fuel economy

Ordered a new Peterbilt 579. Paccar MX-13 510hp. Paccar Automated 12 speed trans. Speced with Dana Spicer rear axles 3:08 ratio. Should I changed the rear gear ratio to 2.something.

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I'm not familiar with that transmission but what you want to find out is, what is the final ratio for 12 gear, and what gear is direct. After we know that we will know how to spec the rear end. I would think the dealer would be able to look that up pretty easy. The ratio for direct is 1 and an overdrive will be something like 0.76-0.87.

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