Revvo Mini Coil Wattage?

Aspire says that the recommended wattage for the Revvo Mini coil is 55-65 watts, when used in the Revvo Mini tank. But when you install the Revvo Mini coil in the standard Revvo tank the recommended wattage is now 70-80 watts. Why is that? And another thing I wondering was what happens when you install the Revvo and Revvo Boost coil in the Revvo Mini tank, is the recommended wattage lower?
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