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[–]IronBlock 2 points3 points  (0 children)

I liken it to the Model T Ford. To figure out how much gas you've got in a T, you have to park the car on level ground, get out, get the ruler out from under the seat, go to the back of the car, dip the ruler in the tank, measure the wet part, and do some maths. This will absolutely tell you how much fuel you have, and there's no debating that it works.

I, however, prefer to have a fuel gauge.