Right now my stove uses a 5/16 flex copper line to feed it ... about 55 ft from the source.
We live in a mobile home so the piping is that PEX 1/2" plastic crap .. very easy and fast stab coupling to work with.
I don't THINK I need to change the water lines.
3/4" gas feed sounds like I'd empty my 100 gallon tank pretty quick.
I really need to research volume usage.