What if you put 87 octane in your Acura TSX?

Using 87 octane fuel in an Acura TSX, which typically requires premium fuel (91 octane or higher), may lead to reduced engine performance and efficiency. The engine could experience knocking or pinging, especially under heavy acceleration, as it is designed to operate optimally with higher octane fuel. While occasional use of lower octane fuel might not cause immediate damage, consistently using 87 octane could lead to long-term issues and decreased overall performance. It's best to adhere to the manufacturer’s fuel recommendations for optimal engine health.