New personal best tank for me...a few more miles on a bit less gas than my previous high, but honestly I think I could have done as well on every tank since I first posted. I think I could have ground this one out to 660 mi, but I was too far from home and without an emergency can of gas. Premium gas on this tank, but I'm going back to regular after having used premium the last 3 tanks and not seen much difference in mpg. This tank was primarily freeway driving.. Think I'm gonna have to stay on surface streets if I wanna get to the 700 mi club !