Euro 2 has nothing to do with speed and economy, it's just an emission control standard.
However in Euro 2 faults in engine are coming e.g. in tappets and connecting rod etc which i have personal experience with
i am not saying that all euro 2 are bad, it's just that claims have risen ever since they introduced euro 2 in late 2012. And this is not
just limited to CG 125, quality has drastically decreased as far as CD70 is concerned as well.