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Mpg with roof racks and box


tsarty17
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Not to sound like a smart a$$, but what did you think would happen?  Extra weight and the added drag to the airflow are a couple killers. https://social.ford.com/content/fordsocial/en/cmax-infographics/3-tips-to-help-maximize-hybrid-efficiency/_jcr_content/content-par/infographic/infographic_image.img.png/1416614808788.png

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Well I assumed I'd lose a few but not 10mpg.

I'm used to diesels where I can tow 10k pounds and lose 1mpg. Haha.

You never said what you were getting before, but on ICE only it's not uncommon to lose 5-6MPG with an empty box on vehicles with smaller engines. I wouldn't doubt the other 5MPG-ish is from the loss in electric mode.  I would be curious to do the same commute in similiar circumstances (outside temp / ac on or off as it was for the last trip) in pure EV Only mode with and without the box to compare those.

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