I can tell you this:
The LED gauge is set to underestimate what's left in the tank. I've been using the PLX Kiwi Wifi OBDII unit with Dash Command for the iPhone. It gives you a % of fuel remaining in the tank, and it's shaping up to be much much more accurate. I think the car's systems know exactly how much fuel there is left, but the LEDs are programmed to go out with a reserve of about 1 gallon. That being said, the miles to empty also goes to ------ with about a gallon or 1.5 gal left in the tank. My friend tested it out 'Kramer style' and drove 30 miles beyond the ----- without running out. He then put 18.965 gallons in his tank!
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2013 Cadillac V-Wagon, RIP Z
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