It is for me. The user manual states how much water and energy is used for each program. For the Auto program a range is given. The water consumption of the Eco program is almost identical to the worst value of the Auto program. I can measure the power consumption using a smart plug and I know that - at least for my dishes - the Auto program uses less energy than the Eco program.
@EarMaster
Sensing some confusion out there.
ECO mode, exactly as the name implies, uses less water and less energy.
https://www.choice.com.au/home-and-living/laundry-and-cleaning/washing-machines/articles/eco-function-buttons
@EarMaster
Under some specific circumstances AUTO might be more economic but that would be the exception rather than a rule.
It is for me. The user manual states how much water and energy is used for each program. For the Auto program a range is given. The water consumption of the Eco program is almost identical to the worst value of the Auto program. I can measure the power consumption using a smart plug and I know that - at least for my dishes - the Auto program uses less energy than the Eco program.