Thoughts on a used 2017 Lexus RX 450h with 40000 miles for $30k? Or in the long run would I just be better off sticking with the regular RX 350 and not worry too much about the gas mileage now?
Stick to a regular gas Lexus, you mention the RX350. They will last longer than a hybrid version, and more mechanics can work on regular gas vehicles over hybrids. Regular gas vehicles have enough complexity as it is; going hybrid adds to that. Usually Toyota Hybrids can go 150,000 to 200,000 miles (generally, even a little more) before battery replacement or something in the hybrid system needs repair and that will cost $$$. Also, finding a competent mechanic that knows how to work on hybrids will be a challenge and being a specialty expect to pay more; going to a dealer would be very expensive as well. I would stick to a regular gas version if you plan to keep the vehicle for a long time and put lots of mileage on it.
https://m.youtube.com/watch?v=p0F5e-lrlWQ
As far as hybrids go, they are pretty good. But as far as how long it will last generally, not as much as the regular RX350.