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I have been searching for few hours for the same issue. Some say there is no way to change it in lxpanel without chnging the code and recompilation. Everyone suggest installing volwheel. But it seems to be dead project with last update in 2010. And I wasn't able to find deb package. Arch users have ...

Nezmer wrote:Is IEC support(Mib,Gib) gone for good?
I can't work with those stupid decimal units.

You can still use IEC units. Just untick the option in
PCManFM > Edit > Preferences > Advanced > Use SI decimal prefixes instead of IEC binary prefixes