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Is there any OBD2 App that shows the true gas level in the tank?

I only ask since my gas light comes on after 380 miles, and I always ended filling up around 8.5-9 gallons. My trip meter indicates I have 0 miles when clearly I have 2.9ish gallons remaining, or one would assume so. I have heard horror stories of people running out of gas and not being able to restart the vehicle due to an issue with the battery.
 

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This is the rest of us, we just reset the trip each time and around 400miles is when I fill up. Usually 1.5 gallons left around then. Most i've gone is like 450miles and there was .5 gals still left.

Whatever read you have for tank average, -2 mpg. multiple by 10 and you will know when you have 1.9 gallons left.
 
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