I meant a 50% savings rate. One of the rules of thumb is to have 25x your desired expenses invested. That's equivalent to a 4% withdrawal rate. So, the savings rate helps you think about how long it will take from the beginning, but I think switching to looking at that expenses vs investments multiple makes sense once you're further along the journey.

"Helping engineers with FIRE" is more like convincing new grads that they have a good job and a path to early retirement even though they can feel hopeless about finances and have a bleak outlook. Showing a compound interest calculator, explaining the free money in the company 401k match, that kind of thing.