Based on my experience you will be happy .Good info here. Same can be said about diesel fuel pumps. A lot of people like to keep a 1/4 tank or more at fill ups just to keep the fuel pump from exploding and tearing apart the entire fuel system. Which ends up being $3k-$5k to replace the entire fuel system. It's a big issue with having CP4.2 Bosch fuel pump failures in Ford diesel's and GM diesels.
As for mpg's, I would be extremely happy with anything over 65+
Holy crap, my last bar starts flashing around 250k. This leaves me with 3 liters according to the manual. So ya I guess around 350k would be right. I fill once it starts to blink thoI average 345km (214miles) when I hit the last bar. I have never gotten the tank to the point when the last bar flashes though.