I have a 2018/68 Niro PHEV.
So far very pleased with it.
Under Covid, I am using no petrol at all as all my motoring is on battery only.
The last fill up I had (supermarket) was in February and am unlikley to need a fill up again until the summer.
Do I need to add anything to the fuel to stop any waxing?
Stale Petrol?
This is a good point. I would suggest you don't charge the battery at all but let the car behave as a HEV. You're doing so few miles the economy is unimportant. Not aware of any additives that do what you say.
UK 2021 Mark 1 HEV 4 in silky silver, standard spec.
previously UK 2017 First Edition HEV in pearlescent white, standard spec.
previously UK 2017 First Edition HEV in pearlescent white, standard spec.