‘Pulse and Glide’ to Save Gas

A group of five ‘efficiency aficionados’ drove an unmodified 2nd generation Toyota Prius to a fuel economy record of 109.3 miles per gallon over 1397 miles in Pittsburg, PA using a driving technique they call ‘pulse and glide’. This was in 2006, but many people still don’t know about ‘pulse and glide’ and how it can save them gas – even if they’re not driving a hybrid. It could cut down on pollution, too, due to decreased emissions while the car is in neutral.

From Metrompg.com:

Pulse and glide works like this: let’s say you’re on a road where you want to go 60 km/h. Instead of driving along at a steady 60, you instead accelerate to 70 (that’s the pulse), and then coast in neutral with the engine off down to 50 (that’s the glide). That’s it. Rinse and repeat. And repeat. And repeat…

By doing this, you’re still averaging 60 km/h, but it turns out that pulse and glide is significantly more efficient than driving along maintaining a steady 60 km/h.

Metrompg.com put the technique to the test in a Geo Metro, modifying the technique to eliminate the ‘turning the engine off’ part, since that wouldn’t be practical – he just put the car in neutral during the ‘glide’ part. (If you’re not familiar with hybrids, the engine shuts off automatically when you lift of the accelerator).

With the engine idling, and the car in neutral, the average mpg shown on the ScanGauge in the glide down from 90-70 km/h was 550 mpg. When you average that against the 34 mpg of the pulse, it works out to an average of 64 mpg. Now we’re at an 8% increase over the steady-state mpg.

I would name the difference between the two techniques “full” pulse & glide (neutral, with engine off in the glide) vs. “mild” (neutral, with engine idling in the glide).

So, now you know the next time you find yourself cruising down a lonely road at a steady speed, you’re not getting the best mileage you could. You could be pulsing & gliding to maintain the same average speed, and saving lots of fuel in the process.

This technique isn’t always practical in real-world driving; it’s best for those long lonely roads where they’re aren’t many other cars around. Of course, it’s all a bit more complicated than the summary above - get all the details at Metrompg.com.

Link [Metrompg.com]

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