I don't know who needs to know this, but if you have add-on roof racks, they are probably lowering your gas mileage.
Gas prices are crazy right now. I hope this can help someone who forgot about taking off those add-on roof racks or removable cross-bars. They cause additional drag, which lowers your fuel efficiency, maybe by as much as 15%. I see a lot of vehicles with the add-on cross bars, with no rooftop cargo, and just smh.
Also, I think about how most gas places in our area sell gas with 10% ethanol, which also contributes to lower gas mileage. There are only two gas places near us that sell no-ethanol-added, but I'm pretty sure they are more than 10% more expensive than Costco, so it's not a good option for us.
**Edit** if this isn't important to you, great. I dropped this here in case people who are trying to be frugal are looking at a simple way to save, and forgot about the removable roof rack. For some people, the savings will add up. #finance