Recent trip (July 22), from Gainesville, FL, to Richmond, VA, 4 adults (my brother alone weighs about 265 lbs), 1 child, and about 80 lbs in luggage, AC on all the time (10+ hours): 47.7 mpg (MFI) and 45.8614 real mpg (calculated). Shell diesel and 1 can of Liqui Moly Super Diesel Additive (300...