[ChillyBear]

Clean the dpfe and egr valve, it's an old ford, that's like half of your mpg if equipped.

Edit, I read further. Its a 460, if it has egr, clean it twice. Helps for economy mode/lean on cruise/ mpg highway mode whatever it's called. I'm guessing it's "heavy duty" if it has an economy mode after 1996.

Side note, I've noticed old escorts like having 10-20% ethanol, no clue on the 460's but they are so sooty, that even if there is no mpg gain like an escort, the carbon removal is good on occasion. Different bores/strokes obviously, but I like all fords with D-shaped heads.