The Ford Model T used a 177 cu in (2.90 L) inline 4-cylinder engine. It was primarily a petrol engine, but it had flex-fuel ability (called multifuel at the time) and could also burn kerosene or alcohol. It produced 20 hp (15 kW) for a top speed of 45 mph (72 km/h). It was built in-unit with the Model T's novel transmission (a planetary design), sharing the same lubricating oil. The T engine was known for its simplicity, reliability, and economy.