I have the same truck. 2008, F-150, Crew Cab, 6.5ft bed, 3.73 gears, 5.4L . Mine is the White sand with tan leather. Bought it new, now has 31, 000 miles.
It will get a solid 16.5mpg on the interstate ( if you drive it 70 mph or less) 15mpg mixed driving (if you take it easy) and 13 mpg in town, and 10mpg or so if I pull the car hauler with the Ford 641 on it or a good load of wood. So will it make 17mpg... maybe but you will have to be on the interstate and drive like an old woman. In 2009 the EPA updated the fuel mileage on all vehicles and the true version of that is more like 11 city and 15 highway. I just looked at my window sticker and it says 13 city and 17 highway, but in small print it says city will range from 10-16 and highway will be 14-20. The above numbers are real world using 10% ethanol blend gas from BP which is the best I can get here. Cheaper gas will get worse mileage.
If you get it get a set or Weather Tech floor mats for the front and back as well as a set of long add-a-leaf springs as it will not haul much without them.
The plugs are a two piece which may break off in the head upon removal, but you can buy a tool to remove them ($80). The ones made in November and later on of 2008 have the plug problem fixed. Check the drivers side valve cover for the date.
You can get the 3.55 gears but it will be weak off the line and get 0.5 mpg more. Ask anything else and I will try to help.
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