Is 140 mph fast?

[OLuke]

140 mph is considered a relatively high speed. At 140 mph, the engine speed is around 3500 rpm. Generally, an engine operates optimally within the range of 2000-4000 rpm, which is referred to as the healthy rpm range. If the rpm is too low, incomplete combustion of gasoline in the cylinders can occur, leading to carbon buildup, which may cause damage to the engine over time. Conversely, if the rpm is too high, excessive wear on the engine cylinders can occur, and prolonged high rpm operation can easily damage the engine. Additional information: At the same speed, different vehicle models may have different rpm levels. While speed is related to engine rpm, the two are not directly proportional. Speed is determined by the transmission, and the conversion relationship between speed and rpm is: Speed = Engine rpm × Current transmission gear ratio × Wheel circumference.