Spazz you never cease to amaze me! The engine is the same between the Trooper and the VX- they are both stroked 3.2L with true 3.5L internal combustion areas. Gearing is probably diffferent between the Trooper and the VX if your mileage differences are true and the 2 vehicles are meant to be driven way differnently. If anyone bought this (or any other SUV for mileage) you bought the wrong one! I have yet to hear of Porsche, Ferrari, or Lamborghini owners complaining of mileage....or visibility concerns.