A very minor point
#21
Re: A very minor point
i talked to my friend about this, and he referenced me a road and track question/answer regarding fuel injector operation during deceleration/coasting:
~~~~~~~~
Quote:
You're correct about electronic fuel injectors being on or off devices. What you suspect is also true; during deceleration the injectors simply aren't opened. This leads to infinitely high "instant" mileage readouts, as you've seen.
The injectors are reactivated when engine approaches idle speed so the engine won't stall.
click here for the full q&a
~~~~~~~~
this means, during deceleration or braking the engine uses no gas if rpms are not near idle speed (~700 rpm). at 40 mph my rpms are around 1400, double that. thus i don't think FAS would help me save any more gas in the scenario i described previously.
~~~~~~~~
Quote:
You're correct about electronic fuel injectors being on or off devices. What you suspect is also true; during deceleration the injectors simply aren't opened. This leads to infinitely high "instant" mileage readouts, as you've seen.
The injectors are reactivated when engine approaches idle speed so the engine won't stall.
click here for the full q&a
~~~~~~~~
this means, during deceleration or braking the engine uses no gas if rpms are not near idle speed (~700 rpm). at 40 mph my rpms are around 1400, double that. thus i don't think FAS would help me save any more gas in the scenario i described previously.
#22
Re: A very minor point
Originally Posted by bluecivichybrid
Thanks Robby,
I'll keep that in mind, but since I'm not that comfortable with FAS and there is plenty of cross traffic on my route (vehicles turning in from driveways and parking lots), i think i'll keep to coasting in gear. 120+ mpg is good nuff for me
I'll keep that in mind, but since I'm not that comfortable with FAS and there is plenty of cross traffic on my route (vehicles turning in from driveways and parking lots), i think i'll keep to coasting in gear. 120+ mpg is good nuff for me
#23
Re: A very minor point
Originally Posted by coz6
When I had my HCH I was always annoyed by the Auto Stop park thing. I used to always turn it off before shifting to Park... However, a few times I had to run after my car a little as I forgot to put it in Park and got out of my car...
Fortunately, on the '05 HCH you can't take the key out of the ignition unless the transmission is in Park. (I just tried it.)
#24
Re: A very minor point
helterskelter-
i just tried FAS today, on a 3.1 mile long (sorry, 4 was an exaggeration), very gentle descent - thanks so much tbaleno and pzev and everybody who supplied all these informational posts - helped me greatly. Using FAS for those three miles instead of coasting in gear boosted my mileage 4.2 mpg, which is a lot for a measly three miles.
route picture:
i just tried FAS today, on a 3.1 mile long (sorry, 4 was an exaggeration), very gentle descent - thanks so much tbaleno and pzev and everybody who supplied all these informational posts - helped me greatly. Using FAS for those three miles instead of coasting in gear boosted my mileage 4.2 mpg, which is a lot for a measly three miles.
route picture:
#25
Re: A very minor point
What about coasting in neutral? Isn't that what started this whole discussion? That's what I really want to compare - neutral coasting vs FAS coasting. How did you calculate the 4 mpg? How many miles were on the tank when the change was observed?
In any case, I think even at 4 mpg, the whole time pegged at 120+ mpg, I really don't think that 3% is going to make much difference. Certainly not enough for me to risk the safety issue of a FAS.
In any case, I think even at 4 mpg, the whole time pegged at 120+ mpg, I really don't think that 3% is going to make much difference. Certainly not enough for me to risk the safety issue of a FAS.
Last edited by zimbop; 10-10-2005 at 06:31 PM.
#26
Re: A very minor point
Originally Posted by bluecivichybrid
helterskelter-
i just tried FAS today, on a 3.1 mile long (sorry, 4 was an exaggeration), very gentle descent - thanks so much tbaleno and pzev and everybody who supplied all these informational posts - helped me greatly. Using FAS for those three miles instead of coasting in gear boosted my mileage 4.2 mpg, which is a lot for a measly three miles.
i just tried FAS today, on a 3.1 mile long (sorry, 4 was an exaggeration), very gentle descent - thanks so much tbaleno and pzev and everybody who supplied all these informational posts - helped me greatly. Using FAS for those three miles instead of coasting in gear boosted my mileage 4.2 mpg, which is a lot for a measly three miles.
#27
Re: A very minor point
Originally Posted by bluecivichybrid
i talked to my friend about this, and he referenced me a road and track question/answer regarding fuel injector operation during deceleration/coasting:
~~~~~~~~
Quote:
You're correct about electronic fuel injectors being on or off devices. What you suspect is also true; during deceleration the injectors simply aren't opened. This leads to infinitely high "instant" mileage readouts, as you've seen.
The injectors are reactivated when engine approaches idle speed so the engine won't stall.
.
~~~~~~~~
Quote:
You're correct about electronic fuel injectors being on or off devices. What you suspect is also true; during deceleration the injectors simply aren't opened. This leads to infinitely high "instant" mileage readouts, as you've seen.
The injectors are reactivated when engine approaches idle speed so the engine won't stall.
.
#28
Re: A very minor point
Originally Posted by zimbop
How did you calculate the 4 mpg? How many miles were on the tank when the change was observed?
Originally Posted by BillR
My ICE actually STOPS, then restarts a moment later!
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