Nope. Say the differential under heavy CPU load is 10W, say you run it under full load for 2,000 hours per year (which nobody does on a laptop), then you saved

Nope. Say the differential under heavy CPU load is 10W, say you run it under full load for 2,000 hours per year (which nobody does on a laptop), then you saved about 20 kWh, or roughly $3.