What is normal for a 2018 PHEV with 75,000 miles on it, in the United States

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Three months ago, I bought a 2018 Mitsubishi PHEV from a dealer in Fort Lauderdale. The unit appears to be in great shape. The tires look new, and the interior is spotless and shows no sign of wear. The CARFAX report indicates constant maintenance by the prior owner. Someone took good care of this car. Thanks.

When I gave the car its first overnight charge (off of a household 120 volt line), the next morning it indicated 12 miles of EV range. I have faithfully charged the car every night for three months with the supplied charging cable. I either charge at 8 amp or 12 amps. As time past, the EV range has increased from 12 miles to 15 miles following an evening charge.

I don't know if this EV range of 15 miles should be expected and is normal from a 6-year-old car. I know there is natural battery degradation, but how much is normal?

Should I take it to a dealer and request that the drive battery be worked on?

What should I ask for?

How much should that service cost?

What should I realistically expect?

What's been your experience in having your drive battery refreshed?

Love to hear your advice.

Bob Hedges
Florida.

What's your average mpg? Range is dynamic not static. You probably don't have battery degradation but are using features which use more of the battery. The simple solution is to learn your driving habits and mate those habits to different drive modes to see which gives you the best fuel efficiency/mpgs. I wouldn't mess around with the 12v auxiliary battery. That's just asking for trouble. Using the drivetrain battery optimally gives great fuel advantages/savings whether you're doing pure EV or mixed driving. Biggest influence on the car's innate engineering is type of driving so familiarize yourself with it.
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