Does pushing in the clutch while going downhill saves fuel?

You still stand by these words, right?????

If so it is pointless to respond to your posts. I'm not going to try and dig up formulas and textbooks to appease you. Name call if you want or challenge me, I already have done my tests and arrived at my conclusion and even relayed my findings.

You know it goes both ways. The formulas do exist. Find them, link them, do the math and prove me wrong. I would imagine someone in a lab coat supported by a government grant or paid by a research firm did something similar in principle as I did. Go find it, link it and prove to the world I'm making up stories.

 

It's not up to me to prove you wrong, you made a claim, got called on it and now you're trying to backpeddle...Talk about losing credibility, look in the mirror...

 

Okay..... student.

You got me, maybe you could tutor me sometime so I could be as smart as you one day.

As I said earlier my interest in the topic is an academic one. I confessed I did do it a number of years ago on a specific stretch of road at a specific time of day under ideal road conditions to maximize benefit and minimize risk. I never made it a habit and nor do I advocate anyone else to make a habit of it.

My situation is different than what it was then. But my answer to the OP is based upon what I have experienced to be true. Everyone else for the most part denies true fuel savings occurs which frankly I find absurd if you have any real observational skills or education in science.

 

Is there a reason you have to talk down on everyone and attempt to cast a shadow of superiority over the forum?

As far as gain in mileage or not:

The OP asked about going downhill. Sure, you may find many places where it's constant down followed directly by an up (especially in the mountains, where your example is from), but there are also instances where it's not. Where I am, there are many hills around me that after you reach the bottom, any gain will be long gone before you get to the next hill. In these situations, you will loose fuel economy by pushing in the clutch. If you want to go even further into it, try just barely using the throttle maintain that "30 MPH faster". In the end, without assuming there is an uphill grade directly after the downhill grade, with strict regard to the original question, no, you will not gain fuel economy.

 

Nice try. But as I see it the OP asked a question. I answered it matter of factly independent of whether or not it was safe, legal or a smart thing to do.

You obviously have a different view.

Why is the burden on me to prove my view any more than it would be on you to prove yours? Because I yanked your chain? Is that the reason it is all on me and not you? Because I brought laws of science into the discussion? I mean really, I can quote laws of science and tell you my interpretation of the effect I believe they'd have but they are hard to quantify without an actual experiment that is documented or a series of mathematical formulas that frankly are more work than I care to commit to. I have personal experience that I shared. I figured you all would call BS, which you did but where's your burden of proof to disprove my claims? If it's good for the goose isn't it good for the gander? Or maybe you might have one set of rules for yourself and a different set for someone holding an opposing view.

 

When you push in the clutch going downhill, what keeps your engine running and at what RPM?...If you coast down the hill in gear, what is the difference in those numbers and what keeps your engine running, like "I" said, very little making your fuel savings extremely nominal and barely measurable...A few hundred RPMs over a few miles will be almost immeasurable although, of course, different...Nowhere near 25%...Dispute that...

 

Here is the copy and paste title of this thread:

"Does pushing in the clutch while going downhill save fuel?"

Personally I read it as "can it save fuel" more than "does it always save fuel". It definitely doesn't say "is fuel savings by pushing in the clutch worth the risks" or "is it a smart idea to push in the clutch on downhill in order to improve fuel economy."

If you're on I-70 in IL there is unlikely to be any fuel savings. That doesn't mean the answer is no. My response basically was yes there can be a fuel savings under certain conditions. It is an academic answer independent of judgement or legal ramifications or safety concerns.

You all seem to be a bunch of nitpickers to me. I knew overwhelmingly I'd get posters to debate me but geez this is a stronger response than I even expected. I care more about being accurate than being popular. If I wanted to have friends I would've gone with the flow and trend of answers before me but I don't deny the truth in order to be liked.

 

You guys are getting in a pissing match over miniscule fuel savings. You'll save way more fuel by turning off the A/C and keeping your tires properly inflated. Just my .02.

 

I'm not trying to nitpick. I'm just trying to show where my answer came from in the midst of your condescending comments about the others and myself that said it won't increase economy.

 

Anecdotal: not necessarily true of reliable, because based on personal accounts rather than facts and research: while there was much anecdotal evidence there was little hard fact; these claims were purely anecdotal.

Source: The New Oxford American Dictionary

Anecdotal: based on personal observation, case study reports, or random investigations rather than systematic scientific evaluation: anecdotal evidence.

Source: Dictionary.com

Anecdotal Evidence: Evidence, which may itself be true and verifiable, used to deduce a conclusion which does not follow from it, usually by generalizing from an insufficient amount of evidence.

Source: Wikipedia

The contrast of anecdotal evidence is scientific evidence. Scientific evidence has no universally accepted definition but generally refers to evidence which serves to either support or counter a scientific theory or hypothesis. Such evidence is generally expected to be empirical and properly documented in accordance with scientific method such as is applicable to the particular field of inquiry.


http://www.asymmetricinvestmentretu...efinitions/anecdotal-evidence-definition.html