Double PS - also discovered a thread by Toyota UK themselves about "Hypermiling" an IQ (same engine as George, smaller car) - Part
1 and Part
2. Somewhat annoyingly they didn't reveal any real secrets but I suppose it was meant as an publicity experiment rather than anything serious - they were spending someone else's money after all
Might email the authors if I can but it was 3 years ago.
EDIT - IQ looks like this
I'm not a fan TBH, it looks like someone punched it's nose.