Now that I got the speedo very close to where it should be the gas mileage is looking much better and can live with it,I think its a 15 gallon and used 3/4 of a tank to go 189 miles so I am figuring its at 16.8 and much better then the little over 10 I was thinking it was getting. Going to refill and get a more accurate figure this week,gas gauge does not work so I got a stick marked off in quarters and the gas is right at the 3/4 used.