Mpg on 4/30/2006 & Miles Driven on Tank

This is a picture of the Last tank of gas that I was running on when coming back from Ky. when the Last White Bar Dropped off. I then was Approx. 73 Miles from my Home in Franklin, TN. I drove at 50 MPH and No A/C. Tires had 55 PSI in all 4. When I was making the left turn into Shell for gas the HCH II started to Jump so I cut the Key off, went to Neutral and Coasted up to the Pump. The gallons to fill tank up was: 13.220=54.41 MPG Actual: