If you’ve ever slid into a car built a few decades ago and noticed a strange “E” next to the gear selector, you weren’t imagining things. That letter wasn’t a typo. It was a fuel-saving tool — and millions of drivers never touched it.
The “E” That Quietly Disappeared
For most of automotive history, gear layouts were simple: numbered gears, “R” for reverse, and on automatics, the familiar P-N-D lineup. But some older vehicles included an additional option — “E” for Economy mode. It wasn’t just a label. It was a physical shift in how the car behaved.
When a driver selected Economy mode, the transmission would upshift sooner and downshift later, keeping the engine spinning at lower RPMs. Throttle response softened. Air conditioning drew less power. According to a 2012 Ram Cargo Van owner’s manual published by ManualsLib, ECON mode also caused the torque converter clutch to engage at lower speeds — a detail most drivers would never think to consider.
The result: less fuel burned per mile. Especially on long highway stretches at steady speed, it made a real difference.
What Drivers Were Actually Leaving on the Table
The savings weren’t trivial. Testing documented by Torque News found that fuel economy improvements from Eco mode typically fall between 5% and 10%. Individual automakers reported even more in controlled conditions. Hyundai reported that Active Eco mode improved fuel economy by up to 7%, while Ford claimed that following its driving recommendations, the 2012 Focus saved as much as 24% fuel in Economy mode. Torque NewsJ.D. Power
The tradeoff was performance. Throttle response was reduced — the car accelerated more gently, even with a hard press on the pedal — and gear shifts happened earlier, keeping engine revs lower. For anyone who didn’t need to race off a stoplight, it was a worthwhile exchange. Nationwide Vehicle Contracts
Why It Vanished
As automotive technology continued to evolve and engines became more efficient, the “E” gear began to disappear from newer vehicles. Advanced fuel injection systems, improvements in aerodynamics, and the integration of computerized management systems meant the engine could automatically optimize performance for fuel efficiency — adjusting the fuel-air mixture, timing, and other factors in real time — reducing the need for a dedicated Economy gear. The Humor Side
Today’s Eco systems work the same way, just without requiring the driver to flip a switch. Some vehicles come equipped with both active and passive eco modes. Active ones require a button press — often labeled “ECO” or “ECON” — while passive modes assess driving behavior continuously without requiring manual input. Oreate AI
The feature didn’t die. It just went underground.
What We Know

Older vehicles featured a physical “E” (Economy) gear mode that altered shift timing, throttle response, and accessory power draw to reduce fuel consumption
When activated correctly, Economy mode could deliver 5–10% better fuel efficiency, according to testing compiled by Torque News and JD Power
Modern vehicles automate these adjustments through onboard computer systems, making a dedicated Economy gear selector largely obsolete
The national average for a gallon of regular gas exceeded $4 for the first time since August 2022 in April 2026, reaching $4.08 per gallon as crude oil surpassed $100 per barrel amid ongoing Middle East conflict AAA Fuel Prices
Economists at the Stanford Institute of Economic Policy Research estimate the conflict has pushed Americans’ average annual gasoline costs up by $857 this year TheStreet

Why This Matters Right Now
This isn’t just automotive trivia. Many states have experienced a 33% year-over-year increase in the cost of a gallon of regular gas, with California hitting $5.89 per gallon and diesel prices upwards of $6.00 per gallon in many states. SmartAsset
The Iran war has driven global oil prices up by more than 30% in recent weeks, including a 24% increase in March alone, according to the U.S. Energy Information Administration. Every dollar saved per gallon matters — and that’s exactly what the “E” gear was designed to address. TheStreet
Modern drivers do have access to Eco modes on most new vehicles. But many never use them — just as many drivers of older cars never touched the “E” on their gear selector. The button exists. The savings are real. The only missing ingredient is awareness.
With gas costs draining nearly $900 extra from household budgets this year, that awareness just got a lot more urgent.