B9-1 除非你天天高轉起步馬路當賽道，不然不會更耗油 The test results show that the fuel with excessively high octane number deteriorates the fuel consumption, especially at low or middle loads. The fuel consumption of the engine fuelled with 97# gasoline is up to 6.5% higher than that of 90# gasoline. high octane number gasoline suppresses the rate of combustion and increases the combustion duration, resulting in the increase of fuel consumption and THC emissions.