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The chart suffers from the same problem as the fuel light - how far you can drive depends on both the amount of fuel left and the current driving conditions. I don't see how the chart is any more accurate than the on-board computer, given the difference in MPG for different road conditions.

What am I missing?

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The on-board computers lie to you so you don't end up stuck on the side of road. The computer tells you that you have no gas when you still have some left.

I agree that the last column of the chart is pretty much worthless. The one that tells the amount of gas left in the tank is good to know.

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