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supercharging tier 1 & 2

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What's the difference between my supercharging Tier 1 and Tier 2

Most of the time I have only seen tier 1 charges....but I went to a different station this weekend and the invoice looks like this -
Power Tier 1 69 min @ $0.14/min $9.66
Power Tier 2 7 min @ $0.27/min $1.89

The car was very near empty when I pulled in nearly full after an hour later, I didn't adjust anything and wondered if the last 7 minutes were some nearly idle charge? as it didn't make sense to charge "faster" for only 7 minutes unless it was nearly full????