Even without futuristic technologies, drivers can achieve eye-popping fuel economy in their current cars with nothing fancier than their brains and some lighter feet. The idea is to maintain momentum much as on a leisurely bicycle ride: accelerating only gradually, coasting whenever possible and constantly adjusting speed to minimize the need to stop.

Trials in Europe, Japan and the U.S. are finding that drivers commonly improve their fuel economy upwards of 20% after deploying a handful of eco-driving techniques. Among them: Driving more slowly on highways, shifting gears earlier in cities and shutting off the engine rather than idling at long stops.

Can’t handle driving this way on your own? Don’t worry, auto manufacturers are adding technology into cars that will let you automatically drive this way.

Within the next two years, Nissan Motor Co. plans to start offering in the U.S. and Japan a feature that it calls the “eco-pedal” — a sensor that, when the driver is accelerating too piggishly, pushes back against the driver’s foot.