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The volt is designed to handle fuel & engine maintenance automatically.
When the engine has not been used for a period of time EMM will run no activity required on your part.
There is no need to actively do it yourself and if you used premium gas it's good for a year, then the volt burns it all off automatically.
If you aren't going to use a tank full of gas in a year, use it how you wish but leave a quarter of a tank for FMM and annual burn off.
Then when needed add the smallest amount of fuel needed to kill the engine maintenance.
Obviously no need for a full tank if you can't use it.
Many threads on GM-volt on this matter
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