The 48-year-old singer and her bandmates - Duke Erikson, Steve Marker and Butch Vig - are getting ready to bring out an LP next spring, their first release since 2012's 'Not Your Kind of People', and she says they've still got a lot to get off their chests.
She said: ''I think we feel we still have some stuff left to think about, to write about, to investigate as a creative unit together.''
And Manson doesn't want there to be too long a wait between their new album and the next one because she's acutely aware none of the band is getting any younger.
She added: ''Of course, time is not our friend, and life is still random. You never know whether we'll be able to enjoy being together as long as we'd hope. For the time being, we're marching forward undaunted.''
Garbage have been touring a greatest hits set in recent years and Manson has no problem with fans coming to their concerts wanting to hear their classic tunes, such as 'Stupid Girl', 'Only Happy When It Rains' and 'I Think I'm Paranoid', and is really pleased people love those songs so much.
In an interview with the Las Vegas Sun newspaper, she said: ''I love it. To me, that's a sign of success, that we've done something right. To be remembered at all in what is now almost 60 years of pop as we know it, to be remembered in the lexicon of music at all is a real honour and a privilege, and something I do not take for granted.
''I don't think anyone (foresees longevity) unless you're a raging egomaniac. You'd be insane to assume you'd enjoy any longevity whatsoever. It's a delightful surprise to be at this point in my life and still see the world and make music.''
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