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That reduced speed you are talking about will help a lot with your mileage. In fact, it might be enough of a difference to off set the difference in weight. I met a guy towing a tri-axle toy hauler, towing with a new 6.7 L F350 and complaining because his mileage wasn't any good. In the conversation, he revealed he was toying between 70 and 80 MPH. Well, duh.
After towing over 15,000 miles, I have established that 58 MPH is the optimum for getting the best mileage. My Big Sky 340RLQ is roughly equivalent to the 3400. I get 9 to 9.5 with a 4:33 rear end. Strong head winds can knock me down to around 8 MPG.
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