designed primarily for maintaining speed and not for achieving maximum acceleration.
When the E was used on the gearbox
Economy gear was at its best especially when driving at a constant speed.
On a flat road or highway, it allowed the engine to maintain a lower rev. On hills or when greater acceleration was needed, it was necessary to shift down to a lower gear.
The principle is still present in modern cars. Even in current manual transmissions, fifth and sixth gears often have long ratios designed to keep engine
