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At the start of October I was getting 530 KM to the tank, now I getting just over 400 KM to the tank. I was wondering what would cause this? I do all my maintenance well before scheduled maintenance is needed.
Being in Canada, I bet your fuel is already winter blend. Winter blend fuel usually begins in September through November, depending on where you live. It has an effect, though I don't know how much of one.
Not sure of the answer either but that's a bunch of decrease in milage. That sounds way too high for the winter blend switch. Try posting in the 5.4 forums...those guys may have an answer for ya.
Gas is changed at the refineries in the winter to a more volatile mixture for starting but you wouldn't notice any difference unless you had a 2 stroke snowmobile etc.