Yeah, you can pump and pump and pump and you might get the 600+ mile tank (not to say that the people that have gotten it did that) - but you are getting no better FE in that case just a longer tank.

As a matter to consistancy I always fillup until the pump automatically turns off (normally the same gas station and same exact pump).

And as an update on my current tank... It looks as though 500 will be in my future (and maybe 600 if I can keep the wife away from the car). According to my spreadsheet that tracks all my individual trip data I am at 113 miles driven, 2.733 gallons used for a MPG of about 41.3. That means at 13.7 gallons used (MTE indicator) I should be at 565 miles driven. My current indicator is about 445 MTE which is on par with this estimate. If I choose to use the final 1.3 gallons in the tank I think 600 might be attainable, but I already hate running it past the MTE.

My car (for the most part):


My old car, now the new bride's car: