For myself personally anyting over 60mg I did not see any greater return.. I have used up to 100mg and it was no different compared to 60mg.
40mg is a great place to start, and for cost-effective purposes it's a great area to stay at..
This is a very underestimated drug, if you literally can dial in your diet this drug can really shine, it can be so multi-functional. Help the drug by providing it with the environment it needs with your macros..