...since those numbers were something I hadn't (yet) looked up, your answer prompted me to do some searching. From page 2 of
NIST Bulletin B-015:
"...For reference, the widely accepted coefficient of expansion for gasoline is 0.00069/°F and for diesel is 0.00050/°F."
...notice how they illustrate how the fuel level "rises" within the neck of the vessel when the fuel is hotter, making it *appear* to be full, when it really isn't. And, the visual deception becomes more apparent the smaller the neck
diameter is versus the fuel tank capacity .