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mikeod: VPL, do you see the disconnect in this? Your original post states that you don't want/like to use plastic. Part of this is because technology can use the information to track your purchase choices (among other concerns). So, to use cash, you have to make two trips to the cashier. And you want technology to solve that?
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Good technology versus bad technology.
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Remember that the volume of gas in your tank will vary with ambient temperature, so calculating how much gas to fill the tank based on miles driven and tank size will only yield an approximation. They would have to develop a very accurate sensor that could track minute changes in levels. But what if the car is not level? Front to back or side to side? That will affect the reading. So if you're determined to fill the tank each time, the problem will continue.
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I could live with an approximation within a quarter of a gallon. And I'm pretty sure the gas tanks are level. It always seems that the concrete pads around the tanks are level.
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Probably the only solution that saves that extra trip to the cashier is to just run the tank down to a level that you're comfortable with, then put in a set dollar/gallon amount. True this won't allow you to calculate mileage on your own, but most modern cars do it for you as you drive.
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Good suggestion, but where I run into trouble is when I hear that the price of gas is due to go up and I go to the service station to top-off my tank. But yes, under normal conditions I could let the tank go down to a certain low level and then put in a set dollar amount. Then I don't have to worry about it being exactly full.