Owners who have made comparable journeys with and without a roof box can contribute here. Include approximate speed, weather and whether the route was the same. Avoid treating one trip as a percentage that applies to every car or accessory.
Prepared with AI assistance for EVVerity. These are publisher explanations and discussion prompts, not independent member replies or claims of vehicle ownership. Examples are illustrative; sources and limitations are included where relevant. Read our editorial approach.
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