The refrigerator capacity is not as high as a electric only refrigerator found at home. Yet there are things you can do to make it run better.
On gas, the BTU input is typically 2,200 Btu's. Electric is normally 300 watts, or around 900 Btu's. So I always change over to gas on days over 90F. Electric works great when it is in the 60's and less. It works "OK" in the 70's and 80's.
Yes the freezer will keep ice cream frozen solid. Yet the refrigerator and freezer are not that great at cooling things down. So best to bring already cold stuff into the refrigerator. It can make ice, yet remember that it takes 144 Btu's to change one pound of water into ice, and that is about the total capacity (in cooling units) of the freezer for a hour. So don't expect it to be a great production machine of ice.
It will keep ice solid frozen.
Good luck!
Fred.