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When I get a vehicle that is new to me, I put a full gas can in the trunk and run 'er dry. That way I know how the gauge behaves- they are different for every car, even cars of identical make, model, and year. Of particular interest to me is how the gauge behaves near or at empty. On one of my cars, when the needle hits "E" IT MEANS IT. On most of the others when the needle hits "E" there is still quite a bit of fuel in the tank and I want to know if it's good for another 20 miles or 60, hence the test.
Speaking of gas gauges, I also note how many miles it takes to go from "over full" to "F", and how many more to 3/4, and so on. I can tell early on if a tank is going to be a good one or not (provided I used consistent top-off method each time).
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