I was going to answer in the 'Real World MPG' a few threads back, but this is a newer thread.
Backstory:
These pictures are from today. The tank was filled last Sunday coming home from an awesome trip. (When I filled the tank the last time, I only filled it to the top of where the nozzle goes.)
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This is when the miles traveled, when the last bar started blinking.
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This is my average and miles traveled from that last fill-up. Now, to refuel.
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Fuel is to the top of the nozzle hole.
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This is how much fuel went into the tank, to that nozzle hole.
Technically, I still had almost another gallon of fuel. So I could've reached 280 miles, if I was easy on the throttle. Now, what I did was, fill almost another half gallon of fuel.
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It's to the top. Not, spilling over top, but no fuel went through the hose to the ground.
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There is the amount to the top. So, theoretically, maintaining my 48 mpg, kind of without trying, 280 miles out of a tank is possible.
I know I don't have to start sweating, if my average MPG is above 45mpg and I'm at 230miles.
Hope this helps and you all don't mind my babbling. Enjoy the day and the ride.