international350, are you calculating your mpg by hand or using the overhead trip monitor?
11mpg is absurdly poor fuel mileage, unless you are doing alot of short trips and/or idling.
just for reference i get 12-13mpg with my 06 towing our 21 enclosed car trailer with a 3500lb car inside. the lowest fuel mileage ive ever had towing that trailer was 10mpg and i had to try real hard to get it to suck down that much fuel. if i tried any harder i would have been arrested for reckless driving lol.
i would say there is an underlying issue somewhere attributing to the fuel mileage you are getting or think your getting.
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