@EV2B I like the handle
I live in Port Moody, we're practically neighbors!
1) Does a used 2015 LEAF provide me enough range? (90k commute both ways)
Yes, for sure. On a 2015 LEAF that's either a Canadian LEAF or a PNW LEAF, the battery should still have 95% of the original capacity (SOH metric on LeafSpy). Assuming you drive the Lougheed Hwy and then on to Barnet Hwy, I know you almost never get over 90 km on that route. In fact, you can likely travel 140 kms in summer time at those speeds. If you go over Golden Ears bridge and then take highway 1, then at 120 km/hr your range will be considerably less. However, we both know that rush hour in Vancouver pretty much makes those speeds impossible
However, for sake of argument, at 120 km/hr your range would be more like 100km during summer. Note that rain, snow, and cold weather in general reduces range a lot. However, even during winter you should be able to make the 90 km round trip without charging enroute.
Just make sure you get an SV, you need the heat pump to get decent range in winter.
2) if it can provide that range, is it healthy for the longevity of the battery?
You should be able to do a 90km round trip for the next 3 years at least. Having said that, do you have any charging options at work? Also, make sure you get a LEAF with the CHADEMO option as there are many DCQC stations already online in the GV area and many more coming. Right now, almost all of them are free! For your commute, the Empire DCQC on Hastings near Hwy 1 would be ideal. There's also a DCQC at Grandview Hwy superstore now and at least two other DCQCs coming online this summer. If you take Hwy 1, there's a new DCQC at the Superstore near Lougheed @ Schoolhouse Rd in Coquitlam. Check out http://www.plugshare.com for details.
3) And if the vehicle provides me enough range now, will it provide enough range in 5 years with normal battery degradation.
Probably, as the 2015 LEAF has the best battery pack Nissan has built to date. Also, Vancouver weather is generally mild which helps a lot with battery longevity. Winter might be challenging in a few years from now, which is why I highly recommend you get the CHADEMO charging package and an SV.
FYI, you will probably shop at Westwood Honda in Port Moody, as they sell a lot of used LEAFs. Before you buy there though, consider importing from Washington. I did that and saved myself a ton of money. Unfortunately, prices have gone up for used LEAFS in WA so the deals aren't quite as good. I purchased from http://www.paramountmotorsnw.com/inventory.asp?showOnly=Nissan, they were very knowledgeable and easy to deal with.
Feel free to PM me if you have other questions or if you want to meet up at a coffee shop to chat, I'm happy to help.