I own a 2000 F250 with the 5.4 liter v-8 engine. I am getting 8-9 miles per gallon ! what is the problem here? I am hearing from other owners talkin about how there getting 14-15. Im going to be pulling a trailer with this truck come spring.... im nervous to see what i will be getting then! Any body have any ideas to what is wrong with thia truck? 8-9 mpg is unaceptable!