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Hi
I use since 10 years a toyota prius in electric mode only. I close the front totally except in summer when temperature is say 30°C or more. When the front grill est blocked, the drag needed due to colling is zero Newton and zero percent of the total drag.
At the opposite, previously, 11 - 12 years ago I drove the same car in hybrid mode, I can very rarely close the front grill, the engine could quickly goes over 95°C.
So I am sure that in electric mode this car need much less cooling then in gazoline mode.
A second point is that pourcentage is not the value I would prefer, Newton is more suitable because for a car having a gazoline version and an electric version, the Cd of the electric model is lower (E-niro... for exemple). So using a pourcentage of a number lower is not a very good way if the purpose is to compare two type of energy.
A third point is that actual ev car have a grill shutter (Ioniq, ID3, ID4...). If you want to know the cooling drag, Newton or %, you need to know when this grill is open or not.
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