[LeozMaxwell]

It's also the kind of thing that has the potential of getting you fired, while they keep the idea and the code.

[abstractbeliefs]

That's true, but if the company is out to extract your worth and throw you away like a squeezed lemon, you're screwed in this job anyway.

Showing it to your manager will either get you a raise or the door, and if you're getting the door, it's best to add your great cost saving implementation to your CV and find somewhere that'll give you the raise.