DTE is calculated by the engine management system, based on fuel consumption since the last time the car was turned on. That's how it knows to count down, anyway.
It knows to reset itself via the float level sensor that's part of the fuel pump inside the tank, which makes it not very accurate over long periods of time (read: more than one or 2 fill-ups without a reset.)
Two ways you can go:
1) Never let your tank go below 1/4 or so. It's good for knowing you'll not run out, if any sediment exists in your tank, it won't soon be sucked into the injectors, and it helps keep the fuel pump cool.
2) Whenever you fill up, or get down to 1/4 tank or so, do a reset on the DTE and let the computer calculate a more accurate number based on the current location of the float, and current fuel consumption.
I use method 2 most often and on more than one occasion have run my car down to 1 or 2 miles to empty with no problems.
posted by 74.69.226...
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