Hey Nick, I'll let you in on a little secret. But don't tell anyone
. Not many people know this but on 87-93 Mustangs there is a gague in the lower right hand side of the cluster. It actully tells you how much gas you have. Imagina that.
If I remember correctly my car has a 14 gallon tank and while I didn't run out of gas I once put in 13.91 gallons. Is that close enough?