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I don't think all cars are the same. It would depend on the brands of parts in the cars and the calibrations of those parts. On my car the low fuel light would come on with 3 gallons left. Then the dealership changed the fuel pump and sending unit. Now the low fuel light comes on with 2 gallons left. I would just drive the car till the fuel light comes on and then fill it up. That will tell you how much fuel is left in the vehicle for peace of mind.
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