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Originally Posted by aerohead
The quanta he reported was constrained by five EPA test protocols legally mandated to be used for new car certification in the USA.
He wasn't given any special latitude.
And the premise of EPA testing is that, anyone 'driving' a BOLT on the same dyno maps 'WILL' come up with the identical 40-miles that GM experienced.
The penalties for misrepresenting car performance are typically too great for an automaker to risk it.
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I'm saying you either misheard, misunderstood, or the engineer was mistaken about regen adding 40 miles of range to a car that would otherwise have 210 miles of total range.
In whatever the EPA test circuit is, I guarantee ~20% of the energy isn't just being wasted by the brakes.
At any rate, the ability to return 80% of braking energy back into useful work makes "technique" relatively unimportant for EV drivers.
Quote:
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In a study on the energy lost in brakes, it was estimated that when a car is brought to a complete halt from 70 mph, approximately 587.43 KJ of energy is wasted. This is equivalent to 0.16 kWh or the energy required to power a 160 W TV for an hour.
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11.2 kWh from all regen / 0.16 kWh from 1 regen braking event from 70 MPH to 0 = 70 braking events.
In other words, during the 250 mile trip in a Bolt, on average, a person would have used regen equivalent to braking from 70 MPH to a stop 70 times to have generated 11.2 kWh of regen.