I know the owners manual and TSM both say that the fuel tank capacity on the Kammback and SX/4 is 21 gallons. However, I've never been able to put more than about 17 gallons in mine, including the two times I've run out of gas completely (latest time was last night). I put in a gallon from a can, drove home, and then put in about 16.5 gallons today. My tank was pulled, cleaned, and repaired so I know there isn't a bunch of sludge in it. Anybody else experience a smaller than advertised fuel tank?
Oh, and I'm not blaming the less than accurate fuel gauge for running out of gas. Totally my fault! It happened to be run out right at the corner of a busy intersection last night about 10. There is a gas station on the corner, but I couldn't get the car into it, so I dashed into to buy a gas can. As I was coming out, a police car was pulling up, so I ran over and told him the situation, got my gallon of gas, and was on my way. He was nice enough to sit behind my car with his lights on so nobody bashed into my car. Eggs to him!