In city, mine is giving me 18.9 on A/C and 21.9 without A/C.
Also, I dont think there are any extra batteries for Eco Idle.
I think the regenerative braking means that the alternator is decoupled with the engine is now a dynamo with the tyres.
More info here: http://www.daihatsu.com/news/2013/0819-2/20130819-2.pdf
Also, the ES comes with an emergency repair kit and not a spare tyre.
Sadly, the repair kit components get taken out by the customs people at the port.
Does anyone have a repair kit that came with the car or is everyone getting spares made?
For tech specs:
2012 Daihatsu Mira e:S LA300S specifications, information, data, photos 293315 &
2013 Daihatsu Mira e 2WD all versions specs and performance
Check for equipment by variant:
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Ordering online (Daihatsu Japan):
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Picture for use of Eco Idle:
Price Table: 1 Yen=1 Rs.
Maintenance Table: