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Level 2 charging has 4x the power so the times you list make sense assuming there is slightly more heat created due to the higher power level. Higher voltage going into the car will have less resistive losses in the wiring. And depending on how effective the battery and charger cooling system is, you may lose more energy just keeping everything running for 11 hours instead of just 3.3 hours.
Level 1: 110V * 20A = 2200Watts
Level 2: 220V * 40A = 8800Watts
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