On a highway trip you should be able to get 350 miles and still have a decent amount of gas to start looking for a place to fill up, maybe 400 miles if there are plenty of gas stations along the highway. That's been my experience on long distance trips with my 2003 S. On the other extreme, when I am at an HPDE I will use over 1/2 of a full tank over a day consisting of 4 sessions of 20-25 minutes each. But I'm fine with that, I see plenty of guys refilling their cars between sessions, they have to have gas cans on their trailers!
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