On the mgguino wiki, the only 2 Ford cars in the list of settings are using values of 15800-15900 for the pulses per mile. All of the data I found on the internet regarding what the pulses per mile value is for my car, all said 8000, but 15900 is dead nuts. My mpgunio is very accurate in the miles driven. Typically on a 400 mile tank, it will be within 5/10th's of the odometer reading. The ms/gal is a little harder to get just right, but most of that has to do with innacurate fillups. Mine has been within .2-.4 gals on a typical 10-11 gal fill. All of this is covered in the calibration link on the wiki.
MPGuino - EcoModder