What is most affected when you drive with an unloaded roof box? | iKörkort.nu
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Common theory questions

What is most affected when you drive with an unloaded roof box?

When you drive with an unloaded roof box, fuel consumption is most affected.

An empty roof box does not weigh much, but its height, shape and placement increases air resistance so much that fuel consumption increases by approximately 10%.

Always remove roof racks and roof boxes when not in use.