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Reducing assist on acceleration can be a good way to increase fuel economy, because the hybrid pack also powers the 12V system through a DC-DC converter.
Depending on conditions the brake regen power may about match the power needed for the 12V system.
If you use extra for acceleration boost you may need regen while maintaining speed.
But when you are accelerating the throttle opens wider which makes the engine produce power more efficiently, while if you regenerate on low power the engine runs less efficiently.
In the worst case the boost replaces efficiently produced direct power by inefficiently produced stored power with charge/discharge losses to boot...
But having boost is not all bad. It makes you go when you need to go, instead of wishing the engine was bigger.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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