Effect of cartop carrier on mileage? - Fiberglass RV

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Old 09-04-2012, 02:13 PM   #1
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Name: Bobbie
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Effect of cartop carrier on mileage?

I have a Thule box I used on my old Forester. I believe I was getting slightly better gas mileage with that while towing than I am now without it on. Does this make sense? Is it acting like a wind deflector? The trailer is taller than the Subaru so it kind of makes sense, but I just wondered what everyone else thinks.

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Old 09-04-2012, 02:33 PM   #2
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Name: Carol
Trailer: 22' Airstream Formerly 16' Scamp
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Bobbie I have used a Thule low profile box on my Outback in the winter and all I can say for sure is that it doesnt negatively impact my mileage - but I haven't tried it towing so cant say for sure but based on design of it I would not think it would.

Looking at the front profile of your trailer it may well be helping out and acting as a bit of a wind deflector.

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Old 09-04-2012, 02:47 PM   #3
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A kayak on my car reduces my fuel economy, towing or not. Never used a Thule box, though.
To every thing there is a season, and a time to every purpose under the heaven... --Ecclesiastes 3
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Old 09-04-2012, 02:51 PM   #4
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I bet it does!
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Old 09-04-2012, 02:57 PM   #5
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Everyone knows that a Thule box creates a forward thrust that negates the added frontal area.
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