I'd say that was an anomaly, do that math by hand next trip and see what you get. If it stays at 28MPG, I'd tow the trailer every where I went! 
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2017 Outback 330RL 15th Anniversary Edition (stationary full timer)
2006 GMC 2500HD Duramax CC 4x4 w/SunLite pop-up camper
Dust Junkies Racing, 3 time Baja 1000 Class Champions
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