What I think would be a good idea for trucks (especially diesels) would be to have a high/low range option in the transfer case, but geared much higher. High range would be an economical gearing for just driving normally with no load, making the best use of the power and torque and gaining quite a bit of mpgs. Then for the handful of times when the average driver really needs to haul or tow something, they can kick it into low range.
Similar to the low range found in some already, except not a granny gear. But they could still offer the granny gear for the few who actually use it.
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Winter daily driver, parked most days right now
Summer daily driver
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