I have an '05 XLT 5.4L. My owners manual says that the fuel tank has a 28 gallon capacity. I've refueled her when the gauge needle was buried on "E" and while the fuel warning light was melting my dash and have never been able to get more than 24 gallons in it (and that's topped off..not another drop able to get into it). Is there a problem with my gauge or is the manual wrong? Thanks.