Even though I'd like to enter my gas in volume units, I can see a potential problem: natural gas has a different amount of methane depending on where it comes from, and this effects the amount of kWh per unit. Ideally we could enter local parameters, like kWh per unit of volume, and save them, then just update how much has been used. This adds complication, so it's not something for the first version.
BTW: Do we need therms? Kilowatt-hours are much better units since they can easily be compared with electricity usage.
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