First, awesome work on saving 50 percent of your income. Your fundamentals are so strong that basically any decision you make here will only have an effect at the margins of your financial life.
However...
I drive to work and need a good vehicle for that, but its only 8 miles or so one-way.
Any car that can go 8 miles regularly is a "good vehicle" for your purposes. The good news is that basically any vehicle built after 1995 qualifies as good vehicle. especially a high mileage Toyota or Honda.
I suggest getting an extremely cheap, crappy car by Lexus standards. Say $3K on a 2000 Toyota beater with 200K miles. Here's why: driving such a beater after driving your luxury vehicle will cause a huge shift in how you see yourself. You'll still get from A to B in the same time (which is the point of having a car), but you'll have a secret. Namely, your transportation expenses are a fraction of your peers' expenses; you're saving a shit-ton of money; and you're practicing not caring what anyone else thinks about your consumption habits. Look at MMM's bit on hedonic adaptation and the stoics for inspiration. Have an answer ready for your colleagues when they say something.
Note: that beater car is objectively pretty good car, especially for your purposes. Most of the time when a car breaks you'll have some warning, e.g. the check engine light comes on, it squeaks a lot, there is a funny smell, you lose power, so drop the rationale that you need some sort of expensive car to be "reliable" enough to go 8 miles and back 5 times a week. My guess is the minimum car price that would satisfy your needs is around $2000. See if you can make do with the minimum (or something close to it), and treat it as an experiment. How does it feel?
Heck - you could keep your Lexus, buy a beater, drive it for a month, and then decide which car to sell. I bet after a month, you wouldn't miss the Lexus. Relative to your income and savings it's an easy experiment (I'm assuming you're making a lot because you have a $400/mo payment and still save 50%).
Let us know what you do.