I have two LEAFs (and a gas car as a backup). I also have two drivers in my household. I noticed that there is some synergy, but not a lot: both LEAFs are usually at their lowest charge around 6-7pm because of all the driving during the day. I think that having 6.6 kW chargers would help (both of my LEAFs have 3.3 kW chargers). What would really help, though, is having an option for a bigger battery. Having one electric car with a bigger range would allow me to get rid of the gas car. For example, if we had a Tesla and a LEAF, we would be able switch all of our driving to EVs.