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Old 10-11-2012, 09:35 PM   #81 (permalink)
slowmover
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Join Date: Oct 2009
Location: Fort Worth, Texas
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2004 CTD - '04 DODGE RAM 2500 SLT
Team Cummins
90 day: 19.36 mpg (US)
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For a travel trailer, deduct 40% from highway mileage as a rule of thumb. For an smaller, more aero trailer, I'd think 30% is do-able. Much depends on driver skill, not just travel speed.

Lower is better. Narrower is better. Total frontal area is the main problem. Radiused edges -- all of them -- is a big deal.

See the U-Haul 12x6x6 trailer as an ideal example. I was able to keep mpg at 78% of normal (behind truck in sig).

And tandem axle tows more easily . . a bit more stability.

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