Ignition vs. Roll start?

[sbergman27]

Engine-off coasting is not always a safe thing to do. It's not always an unsafe thing to do.

What about that time that it seemed safe, but suddenly something totally unexpected happened and it wasn't, and you and your family were killed in the terrible accident that resulted?

Safety isn't about what you expect. It's about what you don't and can't expect. And it only takes once. Think about it.

World energy usage, from fossil fuels, is about 400 exajoules per year. That's equivalent to about 3.2 trillion gallons of gasoline per year. About 100,000 gallons per second. The Yaris uses about 1/30th of a teaspoon of gasoline per second at idle. About 2 thousandths of a millionth of the average world rate of consumption. And, of course, the difference between coasting in 'D' and coasting with the engine off is effectively a fraction of that 1/30th of a teaspoon. Just the difference from engine braking. You can tap the accelerator from time to time to maintain speed, remaining in DFCO most of the time. I'm going to guess that the difference comes out to be about 1/300th of a teaspoon per second. (This assumes that engine braking is costing you about 10%. Works out to about a 3 mph/sec deceleration with your foot off the pedal. Season to taste.) Is it really worth it to save 1/300th of a teaspoon per second? 1/4000th of a gallon per minute?

-Steve

[BailOut]

Originally Posted by sbergman27

Is it really worth it to save 1/300th of a teaspoon per second? 1/4000th of a gallon per minute?

Oil extraction, processing, transportation, refinement and usage are all ecological disasters of an epic scale, and the human fallout from all of it (oppression, war, displacement, etc.) is absolutely catastrophic.

The less each of us uses of it, and the more responsibly each of us uses it, the less the world will need each day. The less the world needs each day the less pressure there is on the whole human and ecological systems.

The way I see it each of us is either part of the problem or part of the solution, and by reducing my demand for oil I feel that I am not part of the problem.

All the scaremongering and fuzzy math (the output of an equation is only as good as the input, and you continually miss a huge chunk of the input) in the world changes none of this.

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We know that some of you don't care for hypermiling but, frankly, I am getting sick and tired of the scare tactics and gloom and doom coming out each and every time anyone posts anything about a hypermiling technique.

You don't see us FE types parading into the Performance forum and bashing speeding or track days or spending huge amounts of money for minuscule gains. You don't see us pestering the Cosmetic forum about the things we think are silly, or making fun of how much money is spent on those types of things.

We expect the same in return here in the Fuel Economy forum. If you have nothing positive to contribute to a thread then please spend your time elsewhere. If you can't stomach conversations about hypermiling then please spend your time elsewhere.

This is indeed the Fuel Economy forum,and hypermiling is a large part of that. Please get over it or move on.

[yarrr]

Originally Posted by BailOut

You don't see us FE types parading into the Performance forum and bashing speeding or track days or spending huge amounts of money for minuscule gains. You don't see us pestering the Cosmetic forum about the things we think are silly, or making fun of how much money is spent on those types of things.

We expect the same in return here in the Fuel Economy forum. If you have nothing positive to contribute to a thread then please spend your time elsewhere. If you can't stomach conversations about hypermiling then please spend your time elsewhere.

Sorry to butt in, but -

People DO bash speeding threads. Going to the track and modding your car is safe and legal, but if you feel the need to bash, go ahead. Turning your vehicle off is not safe, and not legal in most states as has been pointed out. It seems the only person in this thread that "can't stomach" the conversation is you, as everyone else is staying on topic and bringing up valid points which you choose to ignore.