Is it normal for a hybrid battery to do less miles as they get older?

I bought a new Mitsubishi Outlander PHEV Sep 2015 and it has done 9600 miles so far. Charging of the battery was okay, with around 29/30mpg showing after a full charge. These last few months I have been getting no more than 22mpg and as low as 19mpg at times. Is there a fault or is this the norm with hybrids?

Asked on 27 March 2017 by Kevin Fickling

Answered by Honest John
Yes, the hybrid battery gradually loses its capacity to hold a full charge.
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