The only way to ensure the engine doesn't come on is to turn the HVAC off completely. Otherwise if there's a call for heat, the engine starts regardless if the car's moving. However, when it does fire for heat, it runs at near idle and doesn't propel the car at all. So you still see outstanding MPG numbers as long as you keep moving. At a standstill, your MPG will drop, same as any other ICE car that isn't moving.
2019 Kia Niro PHEV EX Premium
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