Sorry about missing the fps. As far as gas mileage we are all looking for that magic item that will increase mileage. I recommend that she use a good fuel injector cleaner routinely. The cleaner the injectors are the better the mileage will be. As far as other suggestions the only thing I can think of is the fuel pump which you already suggested. Good luck and let us know what the problem turned out to be if you ever get it solved!