Below is from the owners manual. I did not realize that miles OR time would cause the percentage of oil life to read lower. So sitting on the dealers lot for a couple of months would reduce the percentage. I guess that is the reason for percentage instead of miles in the setup.
Oil Life Start Value
1. Select this function from the
SETUP MENU for the current
display mode.
2. Press and hold the
SELECT/RESET control switch to
reset oil change.
3. Press the SELECT/RESET control switch for the next SETUP MENU
item or wait for more than 4 seconds to return to the INFO MENU.
Note: Oil Life Start Value of 100% equals 5,000 miles (8,000 km) or
180 days. For example, setting Oil Life Start Value to 60% sets the Oil
Life Start Value to 3,000 miles (4,828 km) and 120 days.