This is one of the few articles I can recall that mentions the car's "regenerative braking" -- in this case a point raised under the "Eco-cred" heading. But the reviewer doesn't really describe it at all, other than mentioning that it's there.
(He spends more time talking about the "eco-assist" display in the cluster.)
Would be interesting to get more info about it. I'd guess it's alternator-based, where it generates much more current when the brake pedal is pressed, or possibly in engine over-run mode (releasing the accelerator while in gear).
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View my fuel log 2014 Mirage ES 1.2 manual: 62.4 mpg (US) ... 26.5 km/L ... 3.8 L/100 km ... 74.9 mpg (Imp)