I recently installed a PHEV 4kw battery kit on my Fusion hybrid. This kit charges
the stock hybrid battery and supplies additional power to the hybrid electric motor when
driving in EV mode or assist mode. It connects to the hybrid battery in parallel and does not
replace any of the hybrid components or factory settings.
So far I am seeing an increase of about 50% MPG on average and have been able to drive up to 2 miles in pure EV mode. If the conditions were right I should be able to drive further. They still need to make an adjustment to the kit to prevent the kit from shutting itself off randomly. I understand I am the first person to install this type of PHEV kit on a Fusion. If anyone else is interested, I can provide
more details.