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I have a 32 foot RV with a V10 Ford engine in it and get a similar mileage 8 or so. You can use many of the hypermiling techniques with the RV to help. Put it in neutral on slight downgrades where you won't gain too much speed. Pulse and Glide will help you too. On big downgrades you will still need to put it in gear to keep the speed down. Keep your speed down. 55 is plenty. I am in California and am limited to that while towing. I don't see any mileage change whether I am towing a vehicle or not. However, bringing the tow vehicle along saves gas a lot since you drive the RV only between campsites and you drive the more efficient tow vehicle to see the sights.
Also, get a mileage computer, ScanGauge or Ultragauge. That will help you with your technique.
Have fun!
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