For example trains have their effectivity calculated by the burner, but since the energy gets added via script, it will always be 1. (tried friction_force, effectivity or effectivity in the burner but couldnt figure out a solution)
my idea would be to read the entity.prototype.burner_prototype.effectivity to calculate how much energy would be added.
i think it would eat too many ups to read the burner effectivity at every tick so i would store it in a global table that gets flushed every time the configuration gets changed.
https://www.dropbox.com/s/y3mthja42kdxbd2/electric-vehicles-lib-reborn_0.1.0.zip?raw=1

I don't really understand you. Are you talking about the effectivity of the vehicle engine?

yes, so we can give trains a higher energy consumption without increasing their acceleration

So then how about making different tiers of effectivity? That would get more interesting with the thing you asked.

hmm interesting idea.. you mean they get more efficient from research?
but i gotta admit i have already copied big portions of your mod for mine (of course i gave credit and its still compatible)
My idea was making e-trains a late-late-late game vehicle, for when you can afford many fusion reactors or have a nice network with induction charging, because it's much less efford to create an electric train than to refill normal locomotives or diesel locomotives (using these as mid-game vehicles)

Ok, so if you know how to do these things (which I assume you do based on the way you wrote), just pull a branch off on mod's GitHub page and make the modifications you want. I'm not really that good at Lua and I don't have much time right now. I'd be very grateful.