Hi,
What does the green line graph mean in testing mode?
Does it have something to do with economy? The help video’s don’t cover this yet. 
Immi
Indeed it is the inverse of the engine efficiency, i.e. the g/kWh rating reflecting engine economy. It shows you at what RPM your engine is the most efficient. The numbers are denoted in your unit of choice. This graph is not very important yet, but will be vital once you put it into a car and have to choose cruising RPMs 
Ah, right. And the percentage next to the economy stats?
that’s the thermal efficiency of the engine at lower rpm (1500-2500) average. how much of the energy content of gasoline is converted to mechanical work.
You need to fully describe the graph; by this I don’t mean that you should note every detail. You might encounter too much information in each figure. I suggest you should summarise the graph by highlighting the most important elements of the graph… This is how you should describe the trends .