Changed the fuel filter about a week ago and went through the first tank of fuel. Considering that the tank was run 1/4 down with the old fuel filter (19 MPG) and the small (?) amount that was lost when changing it, I got 23 MPG on this last tank! Im only guessing that the next tank will be higher . I would've never thought that a fuel filter could make that much of a difference... Thanks for the suggestions, everyone!