Here's a question: it looks like the calcs are based solely on top gear, correct?
According to the spreadsheet, with all my vehicle's data plugged in, I can theoretically get
132 mpg (US) / 1.78 L/100km at an average P&G speed of 40 km/h, with a total 30 km/h speed delta.
And you know what? That's almost bang on
what I observed in those conditions. I did just that one day this summer in my car on an ideal route (a ring road) and after several loops, was averaging
129 mpg (US).
The major difference was that I was pulsing in 2nd and 3rd gears, not 5th.
Cool stuff.