Re: Coasting VS Driving Down Hills
I think it depends on your system. I recall when cruising in a 56
Pontiac 'vert, with a spark plug wired to the exhaust pipe, that you
shut off the engine and coasted and then fired it up again and hit a
toggle for the plug. You got a huge flame from the raw exhaust gases
which were still being pumped through the system while coasting.
Newer systems which are computer controlled may prevent that.
That said, and aside from being illegal in a lot of places, as I
recall you waste the most fuel when starting up. The second biggest
waste of fuel is idling at traffic lights, in traffic (hello, LA),
etc. Would not coasting be akin to idling, and restarting as bad as
restarting if you were to have the engine shut off or die? So, could
it be that, unless a computer is doing something to prevent waste,
you'd be wasting more fuel trying to trick the system than just
And what of any added wear and tear on parts?
I don't know. I'm not an engineer. But it seems like you are not
really saving anything. That it just might be an urban legend that you
On 18 Sep 2005 10:34:32 -0700, "trotzo" <firstname.lastname@example.org> wrote:
>With the high prices of gas lately (you have to get a loan to fill up)
>I've gotten into the habit of sometimes coasting down long hills in
>neutral. I only do this when I can go the speed limit via this method,
>and traffic is light. I was wondering the opinion the masses has on
>this. Does idling vs driving down hills save you gas, and is it enough
>to even bother with? I should say that I drive an 18 wheeler and
>coasting down hills is absolutely verboten for obvious reasons, but you
>can stop a car a lot faster (especially one with 4 wheel disk brakes).
>Is it worth it? I would say in drive, the engine slows while going down
>a hill but not as much as idling. So, I guess what I'm asking is am I
>wrong for doing this and is it worth it?
>Be nice now.....
1965 Ford Mustang fastback 2+2 A Code 289 C4 Trac-Lok
Vintage Burgundy w/Black Standard Interior; Vintage 40
16" rims w/BF Goodrich Comp T/A gForce Radial
225/50ZR16 KDWS skins; surround sound audio-video.
Gad what fools these morons be....
Children are obscene but should not be heard
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