A little less than 1/2 full.
My gas needle is like my **** I let it go in 3/4 then one big push and i sink all 4 inches lol
I try to never let it go below half.
When I was in college i would wait until it quit and then coast into a station. Now I fill it up when it gets down to about 1/4.
Below empty I know exactly how long I can drive