100% is = to 7,500miles by default.
Per manual, page 130. Press and release RESET stem to display "Oil Life XXX%". HOLD RESET = NEW
Press and hold the RESET stem for 2 seconds and release. Oil Life is set to XX% and 'OIL LIFE SET TO XX%" is displayed.
Note: Oil Life Start Value of 100% equals 7,500miles or 6 months. For example, setting OIL LIFE START VALUE to 60% sets the OIL LIFE START VALUE to 3,000miles and 120 days.