I have run 2 8 wheeler MANs with egr at euro 4 and mid 6s is about what we get at 32 tonnes in pretty hard country, loaded mostly 1 way only. Its a bad way to get the emissions.
I tried blanking the 1 truck but the fuel didn’t improve,it just put an emissions light on.
I think you need to have the egr deleted electronically but I haven’t found anyone to do it.
Pursy