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I think more information is needed to help here. Are you in the US? Are you looking at the Alteryx fulfillment of TomTom guzzlers? This would mean your choices are between the latest vintage of "Peak", "Off Peak", and "Night".
If that's the case, the choice depends on the scenario you're using the data for. "Off Peak" is the middle of the road (pun intended) and most similar to the previous methodology guzzlers, so that's usually a good place to start.