My best range on our '01 3.0, as I have posted a few times...wasn't really 'hypermiling', though conditions were very good: coolish temps for much of the ride, good humidity, traffic unusually light for this regular trip from NC to NJ to see DaKidz.
Filled up just across the NC/TN line, on cheap azz regular, and rolled into Magnolia, NJ on fumes ~9 hrs later: 568 miles.
I have done a dozen plus runs in the 550s/low 560s, and I don't set out to run that far without refilling, but this trip it just worked out.
Maybe the dead batt in my bird dog helped, as I was driving closer to the posted limit for the 5+ hour run north in the CopVille VA section.
Car was loaded as usual, but no extraordinary measures, and our 5 spd manual runs at high rpms at cruise speeds.
GL, mD