The rental car company loses out also: I have always filled until the needle matches eg 1/1 = 92% full. Poor "next guy" who actually tops off :-)

No longer a "theory" scientifically tested and proven. A "92L tank" that shows 82L when full that maintains 82.0L until 10L is consumed there is one possibility. The top 10L is off-scale and not measured by the gauge.

Several people have already corroborated my testing it's now a known fact.

The precision is the only question. I haver "rounded" to 10L. The tank may be 93-94L and the unlisted amount could be 11-12L. I've seen 93 or 94L but that probably includes the 3.6L or so below the gauge as well so I like to use 92L for "full" 10L for the unmeasured amount above 82L 1.4L for the "topped off" surge tank that holds about 5L. That leaves almost exactly 1 gallon (3.6L) that is the true reserve amount that is remaining when the gauge reads 0.0L of gas.

That 1 gallon is more than double what is needed to keep the pump submerged and cooled as well as enough to keep the pump submerged at any angle the car can drive without tipping over. It's a genius solution I've not seen in any other car.

Again "in the 0.001% club" of you've read this thread, not one person in 10,000 groks the fuel supply system in the x5.

I spent over 20-25 hours researching this as I mentioned in the first post: 100% of the dozens of pages I found


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2011 E70 • N55 (me)
2012 E70 • N63 (wife)