I bought a Shimano HG40 chain and it was worn out in 6 weeks normal riding on Deore Lx.
Cf my 2008 Jamis Road bike (Sora) uses a KMC Z82 chain and it has done 4000km and still under 1/16th inch wear.
Today I searched for a KMC supplier and mentioned the Shimano chain. The LBS (who has no axe to grind) noted Shimano QC has gone to pot in their Sg factory, it's well known Shimano chains and BBs are "soft".
Trek's reputation has plummeted due to using "soft" BB from the Sg Shimano factory.
So I ordered 2 KMC Z82 chains, and will opt for a VP BB when I need one.
LBS said VP BBs are better than Shimano, since Sg factory tanked.
Avoid Shimano until they raise their QC.
