Ok, now this is freakin' weird ... I check my fuel mileage every time i fill up and been averaging 29 mpg ... This time when i filled up i found that i only got, roughly 16 mpg ... I maintain my truck very well, tune-ups, oil changes, tire pressure etc., it's all kept up ... Truck still runs great and have not changed a thing in the way i drive ... No smell of raw gas like a leak or anything ... Does anybody know what might cause such a dramatic drop in fuel mileage like that ??? ...