https://www.realclearenergy.org/art...n_electric_vehicle_after_all_904060.html

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Of course, there are drawbacks or modest inconveniences of employing the eco mode function. In order to use less fuel, eco mode requires the car adjust its throttle response, shift earlier than usual, and keep the engine running at lower RPMs. The car is less responsive with this reduction in power output.
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Companies that currently offer the eco mode in some of their vehicles are
Honda, Ford, Chevrolet, Lexus, Kia, Hyundai, Toyota, Volvo.
The latest Mini Cooper models have a green mode. It’s only a matter of time before others follow suit with a similar feature.

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