When we have filled up the tank on our LX Escorts (a 92 a 94), the needle is pointing to the right of the 'F'. After 40 miles it would still be midway between the 'F' and the 3/4 mark. If we had not quite filled it (when the gas pump handle shuts-off) it would still be at least up to the 3/4 mark I think.
We get about 29-30 mpg in local driving (the suburbs), up to 37 mpg on the open road. We do almost zero driving in the really urban 'downtown' traffic.
One time I kept driving it, to see where the needle would point when it finally ran out of gas. (I had a Jerry can in the trunk). It got to where it was exactly over the empty line, and the needle moved very slightly to the left of that - and then it quit.