I just got a 95 teg LS. I was wondering if the gas tank is smaller once you get past the halfway mark?

It seems the gas needle drops rather quick once you get past 1/2 tank. I used to have a lude and I cant remember the how it went..

How many miles am I supposed to get on a full tank?

A stock integra. no wait, all its got is a air filter cone stuck directly on the throttle body. I need to find a stock intake. Anyone got one they wanna sell to me? Or even a CAI.

Thanks guys