Take the appropriate action and verify that the warning light turns off.

Taking Action
Message Indicated on DisplayMazda 6 Owners Manual: Driving In Flooded Area
   WARNING
Dry off brakes that have become wet by driving slowly, releasing the accelerator 
pedal and lightly applying the brakes several times until the brake performance 
returns to normal: Driving with wet brakes is dangerous. Increased stopping 
distance or the vehicle pulling to one side when ...
   
Mazda 6 Owners Manual: Fuel Economy Monitor
   The Control Status and Fuel Consumption are switched and displayed by operating 
each icon in the display.
In addition, after completing a trip, the total energy efficiency to date is 
displayed in the ending display when the ending display is turned on.
1. Select the  icon on the home 
screen  ...