 i decided to buy an excursion diesel to be able to tow the toy hauler and bring the family along. i was very dissapointed with the quality performance and fuel mileage. i got 14 mpg on the highway (i have a light foot). when towing the 8000lb toyhauler i got 7mpg on the highway and had to go peddal to the floor on every hill and the truck still slowed down to 40 mph and struggled to make it up small hills. the truck overheated on me 3 times while towing in tow-haul mode so i started towing without it. the truck always struggled with the trailer. My 5.7 liter tundra towed the same trailer without a problem. I always thought ford was the best of all american car makers. obviously i was wrong