The ECON button turns the ECON mode on and off.
The ECON mode helps you improve your fuel economy by adjusting the performance of the engine, transmission, heating system*/climate control system*, and cruise control*.
Honda Civic Owners Manual. Safety Checklist
For the safety of you and your passengers, make a habit of checking these
items
each time before you drive.
After everyone has entered the vehicle, be sure all doors are closed and
locked.
Locking the doors helps prevent an occupant from being ejected and an outsider
from unexpectedly open ...