From driving my wife's Pontiac, I would suggest very small throttle pedal movements. It has a very small vibration when running on 4 cylinders. Large throttle changes knock it out of Active Fuel Management right away. Anticipating hills (accelerating in AFM so it doesn't down shift or kick it out while going uphill) seems to keep it in AFM longer. I don't know if it's more efficient than Driving With Load or not.
Reducing air drag, rolling resistance & weight should help as less throttle movement will be required for the same change. All things I'm sure you will be doing anyway.
You could glue some poster board to the cardboard & paint it. You won't be able to see the ridges of the corrugation that way & it would blend in a little better.
Even if AFM parameters are maintained for an extended period of time the Pontiac will cycle the AFM on & off to keep the cylinders clear. I don't know if your Honda will do that or not.
Good luck
Don
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