The Ampera had some KERS regeneration but really it was negligible in the scheme of things. You could force a half empty battery to recharge some by putting it in mountain mode but again I don;t think it was a very efficient use of petrol.
the mpg was pretty good when in petrol alone, maybe there was some assistance from the electric all the time but I don't think so.
SWMBO has a hybrid Yaris which was our first dip into electric powered cars and I expected it to run for a (very) few miles on electric only but it does about four yards from standing before the engine kicks in. The mpg isn't too bad so I suppose they'd say the electricity was providing assistance all the time. No plug in so the electricity is solely what it generates itself.
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