Based on our limited experience in Ontario with referendums, there's no question that there's a significant cost savings to be incurred by running them conjunctively.
The issue we really incurred in Ontario, though, was perhaps caused by the actual question asked. The message was extremely difficult to get out to the electorate. There were challenges in combination and in some of the public education campaign. Although we were able to get the message there, it was always in a competitive aspect with the mainstream media.
I know my counterparts in Quebec have alluded to the idea that depending on the nature of the question, any emotional issue that would resonate with the electorate may actually ultimately determine whether you would do it independently or in conjunction with a general election.