Join Date: Aug 2014
Location: Southeast PA
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I consistently get 9 gallons in my 2015 451. I usually fill up around 0.5 gallon and fill 8.5 gallons. A few times I've had spillover from the fill spout, but it recedes quickly.
I'm tempted to drive the car a few miles after filling up to see if I can get any more in the tank. Maybe I'll try that sometime.
I think that filling a tank removed from the vehicle is going to be different than filling it installed due to the shape of the tank, filling dynamics, and possibly trapped air. Meaning, just because the internal volume of the tank is 10 gallons doesn't mean you can get ten gallons into it in actual use.
And, yes, it is a bad idea to run the tank empty if the fuel pump or transfer pump is in the tank, it's hard on the pump.