@Alexander Gondolfi way to have a strategic plan coming out of school. You are putting yourself in a far better position than most people your age. If you're serious about expediting the process to FI, sell the car and get an old dependable car in the $5k range. Use that to get a small emergency fund and start the real estate process.
Regarding the 401k, if you have a Roth option (many employers do these days) I would dump all your contributions in there. You are not at peak earning years, so throwing money in the tax free bucket can be very beneficial, even if you can't touch most of it until 59 1/2. HSAs and taxable funds are both fine ideas, but don't hesitate to add the Roth IRA component. You can touch your contributions after 5 years if needed without tax or penalty. One of the big keys in retirement planning is diversity of cash flow. Having money in RE, Roth IRAs, HSAs and Taxable investments should get you there.