Subject	I wish I could but the evidence is observational only.
Posted by	robo (sebring1970) on December 08, 2005 at 6:55 PM
	This message has been viewed 35 times.
In Reply To	Can i get the physics on this? posted by crazysojujon on December 08, 2005 at 06:29 PM
Message	Yet another example of a mechanical, counter-intuitive result. There are tons of variables, such as if the vehicle is fuel injected or carbureted, automatic or manual, the length and steepness of the hill. But the bottom line is that the folks who ran the studies did so for cost reasons, and found no change or worse mileage coasting in neutral, overall. Could it have something to do with the difference in vacuum pressure in the engine when coasting in gear compared to neutral?
Follow Ups	When driving mountain roads where you can "coast" - DougG 15:05:20 12/08/05 You answered your own question. (n/m) - Kenny 15:11:47 12/08/05 I couldn't imagine what it could hurt to literally coast. - DougG 15:15:24 12/08/05 How many hundreds ot thousands of miles of coasting in gear - Zrevolver 15:17:39 12/08/05 your first ?: dunno. second ?: anything that moves. (n/m) - PennStateZ 15:18:59 12/08/05 Coasting is considered dangerous because.. - The-FActor 15:19:55 12/08/05 and illegal in commercial vehicles. - Ballistic 21:31:50 12/08/05 For what it's worth... - Z U N L 15:30:51 12/08/05 I would never coast in neutral in a mountainous region... - Audioquest 15:33:06 12/08/05 Who told you not to shift to slow the car down? - just4kinks 15:49:31 12/08/05 thats what I was thinking...never met anyone whose car died - Zrevolver 16:05:36 12/08/05 Always downshift. Use the brakes as little as possible (n/m) - ben7021 18:00:45 12/08/05 meh, I'd rather replace brake pads than the tranny (n/m) - robo (sebring1970) 18:04:32 12/08/05 i disagree... clutches and trannies are a lot more then pads - AntiHero 19:04:17 12/08/05 We are talking about just the mountains right? - ben7021 19:30:35 12/08/05 right. that makes more sense from a safety standpoint. - robo (sebring1970) 19:46:07 12/08/05 so you think it is better to.... - Zrevolver 20:24:57 12/08/05 Downshift on a hill. Brake on the streets - ben7021 20:36:27 12/08/05 No one is saying dont downshift on hills, I just meant to - Zrevolver 20:45:00 12/08/05 entertaining analogy :c) (n/m) - robo (sebring1970) 21:11:48 12/08/05 would some of the engineering types say that it is an - Zrevolver 21:24:34 12/08/05 Couldn't tell you what their reasoning is - ben7021 21:28:27 12/08/05 depending on how high you're revving the engine with - robo (sebring1970) 18:05:38 12/08/05 How is that so? In gear better gas mileage? - crazysojujon 18:19:38 12/08/05 car uses more gas idling, than coasting in gear. (n/m) - SactoTodd 18:24:40 12/08/05 Can i get the physics on this? - crazysojujon 18:29:43 12/08/05 I wish I could but the evidence is observational only. - robo (sebring1970) 18:55:47 12/08/05 government studies on thousands of their fleet vehicles - robo (sebring1970) 19:26:38 12/08/05 Re: government studies on thousands of their fleet vehicles - merlin3 21:22:26 12/08/05 hmm, that is a different topic since we're talking about - robo (sebring1970) 22:02:58 12/08/05 that is true (n/m) - aliaZ 22:27:19 12/08/05 oh great, I don't think my brain can handle another - robo (sebring1970) 22:41:05 12/08/05 HA! dont all those dumbasses who bought Insights feel stupid - Zrevolver 00:58:23 12/09/05 lol, I wasn't going to open that can-o-worms, but since - robo (sebring1970) 04:44:51 12/09/05 crap! Me and my ELF friends were going to trash the local - Zrevolver 13:15:05 12/09/05 basic thermodynamics - aliaZ 12:40:17 12/09/05
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