Think underground in death valley, CA versus overhead in your own neighborhood and you're own limited assumptions! Conduit, exposure, rise, etc. are ALL considerations that effect the overall calculations, sheesh!!! Sheesh voltage drop AND ability to release heat ambient temps, moisture, sealing,...get a grip you have SEVERAL FACTORS to consider here and the question was valid, especially to a minimum 140 foot run.
Note no mention of a sub panel in garage either, nor ground, nor preventing a return loop.
Stop thinking with blinders on!
IF and WHEN the original poster EVER returns to this string to provide necessary information, oh and that includes if this is an agricultural/residential or strictly residential environment, and WHERE in the WORLD (ambient temps, etc.) the poster is..further discussion would be warranted, as would inquiry, precautions regarding alum, al/co and/or al to co connections.