calling every1 who went 1/2 to 3/4 ton axles!

[dinotruck68]

3/4 ton axles and gas mileage
i know that upgrading to 3/4 axles is good for more abuse and bigger tires. Im not gonna go any bigger than 35's on a 6 inch lift and i want to know my axles wont fail me when i need them but i also want to know that i wont die when i go to the fuel pump. i know bigger tires will lower the mpg a bit. i here 3/4 axles are pretty bad on gas cuz of gearing is this true? if so then cant higher gears be set in in order to help? i know these trucks waist alot of a gas as it is.. i just want to save as much as i can.