At first I thought you meant for a single car! 
Crazy interesting: Putting roof racks on cars hurts mpg to the point of using an additional 100 million gallons of gasoline a year. Removing racks when not used could save 25m gallons of gasoline a year. Study predicts 300m gallons/year by 2040. https://www.nrel.gov/news/program/2016/33696.html …
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You’re mind would be blown about incorrect tire pressure waste. It’s something like 2-4% on average per vehicle or 2.5 billion gallons of gas in the USA wasted on not filling up your tires with to the correct pressure
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