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?
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.
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.
But I just don't see companies spending the dollars or time to solve your concern because the vast majority of the population has no problem putting their gas purchases on a card.
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"the difference between genius and stupidity is that genius has its limits."
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