I will reference my post http://forums.nasioc.com/forums/show...0#post36888210
42.3 mpg displayed over 547.5 miles. The video link is now broken, but I can update it if there are doubts.
It's all about combining E0, pure highway driving, average speed 60-65 mph, and roadway that allows you to just set it in manual mode in 6th gear.
Of course, it is also possible to get terrible mpg. This thing sucks down gas like no other before it has warmed up.