Thanks for your reply. Good point about plug-in car engines only running for short periods of time, I hadn't considered that as a potential issue. Another concern with PHEVs would be resale value, since they keep increasing the electric range of new models, so anything one gets would become outdated very quickly.
I definitely wouldn't purchase a full EV, since the infrastructure doesn't seem anywhere near ready for this in Canada.
To be fair, the Outlander PHEV has a pretty good electric-only range - almost as much as the Rav4 Prime - so I'd be saving a lot on gas around town, but the RX 350h would probably getter better MPG on long drives.
I agree with you about the ES300h, although I don't have one - I had to put in a Lexus model when I registered an account on this forum, so I chose the ES300h since I was planning to get one at the time....but my wife is pregnant and we need an SUV, so the ES will have to wait!