NO. It has nothing to do with the MPG of gas. But the ring and pinion gear ratio does.
Probably the best way to get better fuel mileage would be to get a tuner for it.
They are about the same in fuel mileage but the 6.0 is thirsty.
There is no fuel additive that will increase mileage. This is a myth. None of the snake oil additives work.
get a better car
Better mileage
The best way to get better mpg's is with a tuner/programmer. Most out there guarantee better fuel mileage.
diesel.
10 bolt or 12 bolt has NOTHING to do with gas mileage. It is the gear ratio that is inside of the rear end housing that affects the mileage. The lower the gear the lower the fuel mileage is. The higher the gear, better the fuel mileage is.
less wind resistance, better fuel mileage
Less weight = better fuel mileage.
Better fuel mileage and cleaner emissions.
Depends on needs. Fuel mileage, power, etc.....