I own a 2013 Ford Fiesta SE. Today I went to go put some gas and usually $20 is enough to fill the tank. The gas price here is in Houston is $2.49 right now. I was running with 25 miles left. I added the $20 which was 8 gallons thinking my tank gauge would go up to the F but it only went up to the line before it. What is weird though is that it says I have 324 miles now. That is usually the highest I have gotten my Fiesta to go up to in the past. I've had it at 324 mi to e with the line at Full why is it not full yet has that amount of miles?