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You won't see any fuel savings by alternating between heavily loaded and moderately loaded. You have to alternate between heavily loaded (at a minimum of RPM) and engine off, or nearly off.
Now that you've added a 4kW accessory load, I think you'll need to switch from P&G to DWL. You'll also want to drive slightly faster to get there sooner, because the sooner you get there, the sooner you can shut off the A/C.
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