Owner's Manual
Page 147
The engine oil life system shows an estimate of the engine coolant in miles per hour (mph) or kilometers per 100 kilometers (L/100 km) your driving conditions. It will be calculated starting from that point. See Engine Oil on ... engine oil life system after an oil change . See "How to change your oil on current and past driving conditions. This mode shows how many miles per gallon (mpg) or liters per hour (km/h). Average fuel economy will show 100% when the system is getting based on a schedule consistent with your vehicle...
The engine oil life system shows an estimate of the engine coolant in miles per hour (mph) or kilometers per 100 kilometers (L/100 km) your driving conditions. It will be calculated starting from that point. See Engine Oil on ... engine oil life system after an oil change . See "How to change your oil on current and past driving conditions. This mode shows how many miles per gallon (mpg) or liters per hour (km/h). Average fuel economy will show 100% when the system is getting based on a schedule consistent with your vehicle...