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Old 07-06-2012, 10:54 AM   #68 (permalink)
Diesel_Dave
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Join Date: May 2011
Location: Indiana
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White Whale - '07 Dodge Ram 2500 ST Quad Cab 2wd, short bed
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Quote:
Originally Posted by MetroMPG View Post
In the section Braking: Or Lack Thereof, various scenarios about anticipating slowdowns/stops ahead in traffic are laid out, with lots of attention to timing traffic lights.

The idea that the (friction) brakes are your enemy is made (and made, and made again ).

But there's an advanced technique where the brake pedal IS your friend, and it's not mentioned: There are times when it pays to brake early in order to scrub enough speed so you can now coast along at a lower speed / longer duration than you otherwise would have been able to if you had only coasted.

EG: say you're faced with a stale red light where you could do a considerable amount of coasting, then lightly brake at the end to finally come to stop at the stop line. You could do that.... OR you could do some early braking to scrub some speed, with the result that you can now coast for longer, at a slower speed, and you reach the intersection still moving when the light changes.

In other words:

Option #1): Coast first, light brake to a stop.
Option #2): Brake first, coast at a lower speed, and preserve momentum so you avoid having to stop.

Or, I could have pointed to tip # 49 on our driving tips list.
Very good point. I do this all the time. I think of it as "damage control". Ideally, you shouldn't have had to brake at all, but, if the lights turned on you unexpectedly, the goal then becomes to pass through the light at the maximum possible speed (i.e., scrub as little of your speed off as possible).
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Diesel Dave

My version of energy storage is called "momentum".
My version of regenerative braking is called "bump starting".

1 Year Avg (Every Mile Traveled) = 47.8 mpg

BEST TANK: 2,009.6 mi on 35 gal (57.42 mpg): http://ecomodder.com/forum/showthrea...5-a-26259.html


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