Launching tomorrow: which lever actually moves your FIRE date most?

ClaryFIRE launches on Product Hunt tomorrow — a free calculator that turns income, expenses, savings and investments into an honest FIRE date. No account needed.

One pattern that came up while building it: for most people, the FIRE date moves more from a small savings-rate bump than from chasing higher investment returns. A 5% jump in savings rate often closes more of the gap than an extra 2% of expected annual return — but return assumptions are what most people obsess over.

Curious what this community has found: what's the one lever that moved your own FIRE timeline most once you actually ran the numbers — savings rate, expenses, or returns?

Will drop the link here once it's live tomorrow if anyone wants to test it against their own numbers.