Tow Mileage Stinks. Suggetstions?

[CYauch]

Ok, this weekend if the first time i've towed anything with real weight for a long distance. Normally, i pull a boat (about 3,400 pounds) a few miles to the launch, a two-axle traile with a 24hp tractor a few miles, but nothing over 4,000 lbs in general. This weekend, picked up a new TT in Pochatoula, La (unloaded weight about 6,800 lbs). On the way over there, barely burned 1/8 of a tank for 129.4 mile distance (overhead said 19.2 mpg).

On the way back, holly 'l love to drink fuel' batman!!! I kept the speed around 67-70 and the thing drink fuel like my ex-wife drank Vodka!! Pulled into driveway, and it's a tick below half a tank. Suggestion's on how to improve this mileage??? For what its worth, the trailer is a 2009 Puma 30FQSS. While i didn't buy it here, this link has good exterior pics. Not the most areodynamic trailer, but man, i expected a little better fuel mileage. Puma 30FQSS Travel Trailer RV at Cheyenne Camping Center

I have an Equalizer 4-point sway control hitch, and I'm wondering if i need to tweak that, and maybe get a little better mileage? Truck rode like a Cadilac before this trailer, but now, the thing bounces like crazy. Left / Right sway isn't that bad, and the front end bounce dampens out after 3 or 4 oscillations. Rear end of truck still appears to sit a little high after hitched up which is why i'm thinking i need to adjust. I can take a pic if anyone thinks it may need adjusting. I'm a noob with this setup so i don't mind being called a noob :-)