Is the panel in your garage a sub panel or main panel?
Is the garage attached to the house?
If this is your main panel, then you can free up bus bar space by putting two grounds under the same screw. But only one neutral per screw.
I believe the same rule applies to sub-panels in a garage if the garage is attached.
Another option, add another ground/neutral bar in the panel.
Is the garage attached to the house?
If this is your main panel, then you can free up bus bar space by putting two grounds under the same screw. But only one neutral per screw.
I believe the same rule applies to sub-panels in a garage if the garage is attached.
Another option, add another ground/neutral bar in the panel.