Most modern drivers would not recognize the mysterious **“E”** once found on older cars. The letter stood for **“Economy,” or “Efficiency,”** and appeared on many vehicles from the 1980s and 1990s. Introduced after the 1970s oil crises, it helped drivers save fuel by reducing unnecessary engine power. Unlike today’s automated systems, the feature gave drivers direct control, allowing them to choose fuel economy over performance with a simple switch or gear selection.

In automatic cars, the **“E”** mode changed how the transmission shifted. It moved into higher gears at lower engine speeds, reducing fuel use and creating a smoother ride. Many vehicles also started in second gear, making acceleration gentler and preventing the engine from working harder than necessary. Instead of quick bursts of speed, the car focused on quiet, efficient cruising. In manual cars, the **“E”** often appeared on the gear knob as a special overdrive gear, especially in classic Volkswagen models. Once cruising, drivers could shift into **“E,”** lowering engine speed, reducing noise, and improving fuel economy. The trade-off was slower acceleration, so drivers had to downshift when climbing hills or passing other vehicles.

As automotive technology advanced, electronic control units gradually replaced the old mechanical system. Modern cars now monitor speed, throttle input, and engine load automatically, adjusting gear changes and power delivery without driver input. Multi-speed transmissions and software-based **“Eco Mode”** replaced the traditional **“E,”** while also controlling climate settings and other systems to maximize efficiency.

Although today’s **“Eco Mode”** is more advanced, many enthusiasts still remember the old **“Economy”** setting because it created a stronger connection between driver and machine. Choosing when to activate it was a deliberate decision that encouraged smoother, more thoughtful driving rather than relying on automatic technology.

The physical **“E”** may have disappeared, but it remains a symbol of a time when fuel efficiency depended as much on the driver as the vehicle itself. As the original article puts it, driving was once **“a conversation between human and machine,”** making the forgotten feature a lasting reminder of a different era on the road.