Here is a video of my best tank... It was a year ago... Looking forward next Summer to beat this numbers by far, because I changed my wheels this weekend and change from a large heavy 225-45-17" wheels for a much lighter and thinner 205-55-16". It was a big difference in driving: much more comfort, lighter steering, and also I put 4 new low rolling resistance tires (yokowama c-drive 2 - check video), so it seems...
Rolling resistance comparison: