Automakers alter the gas gauge in your car so even when its on E the car has a gallon or so left. I was driving my dads fiances Corolla the other day, and it was on E. I mentioned it, and she said the car has a few gallons left. In fact when I got off the side roads, and onto the highway the needle went up.
In your case I'd say to round it down to 9 gallons. That means range wont be accurate, but it wont be an overshot. I dont own a Scangauge, so I dont know if theres a .5 gallons, or not, but if there is, than go with 9.5 gallons.
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