I noticed my manual says it has a 19 gallon tank. The other day my car was on the E line, and the light came on. Right when the light came on, I pulled in and filled her up (hehe). It used exactly 14.2 gallons. Is there really a 5 gallon reserve on these cars? Can the tank actually hold 19 gallons. I mean, is it actually possible to fill the tank up to its max?