Picked the only category that was close enough but we're 3+EV as we're a 3 driver family (4 cars) -- LEAF, smart for two coupe, Miata and a VW Routan. The Routan is the utility/long trip car that may get swapped for a new Ford C-Max hybrid or plug-in Energi; reason being is that it's also my winter commuter when the Miata gets stored and getting harder to justify keeping it (have been keeping track of when a smaller amount of space would work just as well). We recently took a long weekend up to Door County in WI with the Routan and one thing I won't do is give up the higher driving position back to a sedan -- being able to see what traffic is doing way in advance, etc. has always been a favorite thing of mine with past SUV's (owned 2 Isuzu Trooper's which started the whole thing) and now this being our third minivan.
Our LEAF has worked well as a daily commuter for any of the 3 drivers as well as our 'go to' car for most weekend errands but there are those occasions when more range or storage, etc. is needed and having something in the garage versus the hassle to rent something is an 'opportunity' cost we'll see how long we want to pay for. This is one reason that I would be interested in Nissan offering an ICE temporary rental program depending on convenience and cost. If they did and it was an attractive option, we would downsize the minivan to a PHEV with the ride height we're looking for -- the C-Max is in-between, higher than a sedan but lower than a full-size SUV and probably only need the Nissan ICE rental when we need the extra space that our minivan gives us. Ideally, if Nissan went the Zip car route (but with more mileage allowance) with a lock box, and online reservation service, etc. that would be great -- of course Zip car's rates make it only feasible for very short periods so again this wouldn't be attractive for someone to take a Nissan ICE for a week long trip vacation!
One thing I haven't explored much (and perhaps others will post their experiences here) is how much and how long, etc. did you seek out an alternative when your LEAF's range just simply wasn't going to cut it --- in state, out of state, how long, etc.
I would guess we're all pre-planners with the need to charge it as well as limited range so I'm sure those with the LEAF as their only car this has come up ...