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I think that is a difficult question to answer. I think it will very much depends on the speed you tend to travel at. When I towed a caravan I used to have a roofbox on the car and in Germany where you generally tow at lower speeds the economy improved but as soon as I entered France with higher speeds the economy was about the same with or without.. I appreciate that it dosen't amswer specifially what effect it would have on a motohome but suspect speed and driving style will be an important factor.

David

I would've thought with the amount of disruption to air flow caused by the "roof furniture" that MHs already have (aerials, roof vents etc),coupled with the fact that they only start off with the drag coefficient of a Porta-cabin anyway, the fitting of a roof box would make very little, noticeable difference...

If you are concerned, is there anyway of incorporating some form of deflector/"aerofoil", similar to Caravanners used to stick atop their cars...?

Quote: Originally posted by ldpdmp on 21/12/2013

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roof boxes will always lower fuel consumption no matter what.  The faster you go the lower it will drop

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