I've found the "Normal" mode gave me the best results
so far, although my assumption is that all the modes will return *mostly* the same economy based on this graph:
View attachment 1234
Based on that, once whatever mode you're in reaches the steady state, it will run in parallel mode engine on for awhile, then go EV mode/engine off, then engine on/parallel, over and over again - this should return about the same economy in the same conditions/speeds no matter what. There will be a spot on the state of charge where the battery has a lower ESR/internal resistance at a certain state of charge, but there's not likely to be a
massive impact there - so the battery will accept charge and give up charge with the least amount of thermal or chemical losses, normally this is at low to mid states of charge for most Li-ion batteries, so the normal mode which is around 30% SoC is probably near an optimal location for this charge/discharge activity to occur.
I will probably try Save or Save+Eco for my next trip data points I want to collect for my fuelly logbook.