7 hours 20 minutes door-to-door. Stunningly, on one tank of fuel - 464 miles on 13.3 gallons, done by setting the cruise control to 65 mph and letting it get on with it.
I once did 621 miles on ~63 litres - Frankfurt to Cambridge (and then a bit of daily commute). (That was in a Cavalier, so the pootling around on autobahns at up to 90 mph was not too gas guzzling.) 464 miles on ~50 litres is pretty damned good.
I think the pump at this end cut off rather sooner than the one in Dallas, so the consumption was higher than that, but still not bad for a 3-litre V6 (Ford Taurus).
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(I dream of 27 mpg. UK gallon too.)