I am a little bit skeptical of exceptionally high Scanguage numbers.
Although I have calibrated to within 1%, and it does match my pen and paper results *almost all* of the time, I have noted a few quirks.
Namely, I was able to get the live fuel economy display to toggle between 90.0 MPG and 120 MPG for many miles with cruise control applied during a flat stretch, with NO other number showing! You can see this in the short video clip below, and also note the current trip FE of 103 mpg:
http://www.100mpg.ca/wp-content/sg-quirk-120mpg.avi
During the same trip, I was able to get Scanguage to toggle between 113 mpg and 170 mpg, again, for many miles:
http://www.100mpg.ca/wp-content/sg-quirk-170mpg.avi
Your thoughts?