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I have run it down to "0" many times but have yet to stick a couple of gallons in a can in the back and run it until it QUITS, thereby figuring out exactly how much is in there when it says "zero".
Capacity is not the same as usable capacity. I've gotten 13.5 gallons in on a refill when I ran it to zero, and over 13 several times. I'm not sure I buy there's another 2.5+ usable gallons in there..... that's quite a lot.
With the vent blocker removed from my Jetta diesel I've gotten within a half-gallon of published capacity and did not run out, but the pucker factor on that was quite high, as it was unintentional -- and running out in a diesel, with no tools to bleed the injectors, is a BAD thing.
Last edited by tickerguy; 12-18-2016 at 09:05 PM.