R-Class (W251) Produced 2006-2013: R320CDI, R350, R420CDI, R500

R350 driving with Roof Rack

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Old Sep 10, 2015 | 04:09 PM
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shrini23's Avatar
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From: Houston, TX
2010 R350 BlueTEC
R350 driving with Roof Rack

Have been arguing with my buddy on this.
My buddy keeps saying that if I drive my R350 with roof rack on everyday purpose i'll have drop in mileage due to the aero dynamics. Is this true?

I drive a diesel and how much is this true?
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Old Sep 10, 2015 | 07:35 PM
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marc hanna's Avatar
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From: Nova Scotia, Canada
2023 GLK250, 1987 560SL
More wind resistance equals poorer fuel economy. But I doubt it will be significant enough to notice.
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Old Sep 11, 2015 | 05:12 AM
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2006 R350
It depends totally on what your daily commute is...

If it is spent on the highway at speeds over 50mph, yes it will definitely impact MPG. If your daily commute is just around town, then no...

But your buddy is correct that the roof rack impacts aerodynamics, and that does impact MPG.
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Old Sep 11, 2015 | 08:08 AM
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The solution is to send me the roof rack and that will improve your gas/diesel mileage.
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