Looking to get a 3/4T SUV. Just wondering what the mileage is on the differnet options. I will get around 2000 model year 4x4 etc... Excursion 5.4L V8: can only imagine this little engine has to work pretty hard to go anywhere. Especially towing a large toy hauler. Excursion V10. Wouldnt have to work too hard, but loves gas no matter what. Suburban 6.0L. Better than 5.4L mileage???? Suburban 8.1L. Loves gas?