How much does Autostop really save? - Page 5 - Insight Central: Honda Insight Forum
 
Go Back   Insight Central: Honda Insight Forum > 1st Generation Honda Insight Forum > Honda Insight Forum 1st-Gen Discussion

Please Visit our Site Sponsors Page
Insightcentral.net is the premier Honda Insight Forum on the internet. Registered Users do not see the above ads.

» Auto Insurance
» Featured Product
» Wheel & Tire Center

Reply
 
LinkBack Thread Tools
Old 01-05-2013, 04:47 PM   #41 (permalink)
Senior Member
 
Join Date: Apr 2012
Location: baltimore md
Posts: 126
Default

Quote:
Originally Posted by theaveng View Post
I also disabled autostop (yesterday) by keeping the car in first gear and engine idling. So far I've not noticed any change in this tank's MPG average.
ok you can ignore my previous post ....
I'll repeat it anyway... here...

Quote:
Originally Posted by bibendum View Post
to explain how much it saves you may want to consider how much
fuel it uses at idle per minute.

If you take my guess that gasoline fueled engines burn fuel
at the rate of 8 oz per horsepower-hour...

and that an insight at idle is using 4 horsepower?

one hour at idle is a quart of fuel
or about 1/2 oz per minute.

( I think this is a low side guess. idle seems to use more fuel)
...
you log how long you sit at idle per tank.
your answer will be obvious.

victor
bibendum is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 01-05-2013, 04:54 PM   #42 (permalink)
Senior Member
 
Join Date: Sep 2012
Location: Irvine CA
Posts: 519
Default

Quote:
Originally Posted by dandism View Post
You're wasting gas, creating emissions, and adding extra wear to your engine. Why do you want this? Is The Citrus Smoothie right?
No I'm not a troll. I'm an engineer and engineers question everything, especially when it comes to machines & their operations. I've been contemplating what to say, but no matter what I utter, you will probably condemn me. I'll just point out:

- my car only stops twice per trip (a light when I enter the interstate & a second light when I exit)
- so we're only talking about 30-40 seconds of idle stop that is not happening
- my idling engine uses just 0.15 ounce per minute (approximately)

Out of the ~2/3 gallon or 85 ounces I burn on that trip, I'm wasting 0.08 ounce with my little experiment. Or one-tenth of a percent.
__________________
OWN: 61mpg Insight (greenercars.org score: 57)
both blue and silver,
and a 45mpg BeetleTDI (score: 47).

Last edited by theaveng; 01-06-2013 at 03:22 PM.
theaveng is offline   Reply With Quote
Old 01-05-2013, 05:35 PM   #43 (permalink)
Senior Member
 
Join Date: Apr 2012
Location: baltimore md
Posts: 126
Default

one more bit of information....
how long in minutes or miles is your interstate trip?

you might sit at idle for a minute and 20 seconds each way
so using your own numbers the most you will spend per trip
is a half an oz of fuel.
or about a quarter a mile lost in the worst case scenario.

if you are like most people you will not notice around 2 to 3 percent.

so I am thinking your trip on the interstate is more than 12 miles

one way on my commute, I can sit for 12 minutes at lights.
most days it is around 5 minutes.
most days I run for 40 minutes and I do notice the difference with autostop.

victor
bibendum is offline   Reply With Quote
Old 01-05-2013, 06:13 PM   #44 (permalink)
Member
 
Join Date: Sep 2012
Location: San Jose, CA
Posts: 43
Default

Quote:
Originally Posted by theaveng View Post
No I'm not a troll. I'm an engineer and engineers question everything...
An engineer who questions everything gets nowhere. If you're going nowhere, you're going to want auto-stop.


But seriously, if you only have a few stops in your daily trip then auto-stop won't have a large impact, but I still don't see why you would want to disable it.
dandism is offline   Reply With Quote
Old 01-05-2013, 09:27 PM   #45 (permalink)
Moderator
 
Join Date: May 2009
Location: Richmond, VA
Posts: 6,143
Default

I find when I disabled it it makes the heat warmer, the ac cooler, clutch engagement smoother on the cvt and if you are in the cycle of a negative recal it emerges from it faster.

Plug you can lift from the brake petal lightly and creep upwards to trigger lights.


Sent from my iPhone using AutoGuide.com App
__________________
Fully Eco Modded 2010 Honda Insight PHEV
Semi Eco Modded 1995 Suzuki Sidekick LJX
Cobb is offline   Reply With Quote
Old 01-08-2013, 02:35 PM   #46 (permalink)
Senior Member
 
Join Date: Sep 2012
Location: Irvine CA
Posts: 519
Default

Since someone suggested measuring my time spent stopped, I did that in a previous post. It is about one-tenth of a % more fuel burned per trip to work (if the engine is left running at stops). About 1/10th of an ounce of gasoline wasted.
Quote:
Originally Posted by Anonymous
Quote:
No I'm not a troll. I'm an engineer and engineers question everything, especially when it comes to machines & their operations. I've been contemplating what to say, but no matter what I utter, you will probably condemn me.
I don't mean to insult you, just to point out how your posts appear to others. To me, you do behave "troll"..... You don't ask advice and don't know enough to offer it. You provoke us with "research" and then argue. Most of what you say is either against our conventional wisdom, or against Honda's guidelines.
Conventional wisdom is often not wise at all (and sometimes flat wrong). By the way I question the very existence of God. I also question that Honda is godlike in their knowledge or that I should just blindly follow them. They've made mistakes in the past.

I think people should learn to be more tolerant of others, even if they think it's wrong. TOLERANCE is the key to human beings getting along with one another, especially when humans come in so many different flavors (american, european, asian, african, christian, jewish, muslim, buddhist, young, old, middle, engineers, not engineers, Doubting thomases, loyal followers, et cetera). I am in the doubting thomas category. I question everything. By the way I've owned an insight since 2002, so I have as much to contribute as any other driver who has owned one an equal amount of time (though I've driven fewer miles). I am not going to hold back my opinion or thoughts.

In any case, even if I annoy you, there's no call to act like a high school or college student and start using names like "troll" or "A-hole". The moment you reach adulthood, you should stop with the name calling and resolve the differences as an adult would. Not with hate or insults.
__________________
OWN: 61mpg Insight (greenercars.org score: 57)
both blue and silver,
and a 45mpg BeetleTDI (score: 47).

Last edited by theaveng; 01-08-2013 at 03:36 PM.
theaveng is offline   Reply With Quote
Old 01-08-2013, 02:59 PM   #47 (permalink)
Lifetime Member
 
Mark Elvin's Avatar
 
Join Date: Feb 2007
Location: Bristol - UK
Posts: 837
Default

The way I see it is it has to save SOME fuel or Honda, with their wealth of knowledge, wouldn't have bothered with fitting it.

I suspect it may have been the 'magic ticket' that took the Insight to 80g/100km

Sent from my GT-I9100 using AutoGuide.Com Free App
__________________
2003 Quantum Grey G1 Insight
83.5 LMPG
25,500 Miles
IMA C&C (to be fitted)
ODBII C&C
Mark Elvin is offline   Reply With Quote
Old 01-08-2013, 05:38 PM   #48 (permalink)
Senior Member
 
Join Date: Jul 2008
Location: UK
Posts: 577
Send a message via MSN to jonnyvtec
Default

Indeed. NEDC has a large amount of stop periods where it effects the measures CO2 average over the cycle.

I don't think it's the best thing for the thrust bearings mind you.


Sent from my iPhone using AutoGuide.com Free App
jonnyvtec is offline   Reply With Quote
Old 01-08-2013, 05:45 PM   #49 (permalink)
Moderator
 
Join Date: May 2009
Location: Richmond, VA
Posts: 6,143
Default

Good question as the later Insight and HCH claims cylinder deactivation. Its documented the HCH runs on as little as 1 cylinder, but we dont know the gallon per hour usage. I see it on the newer Insight and the scion xa I had that uses the same engine as the prius 2 and the scion uses about .4 less fuel an hour than the newer insight.

On the other hand my Insight idles a lot and it seems to have little effect on mpg vs non hybrid cars. For example when I had a ford focus with the wing and + sized wheels a few years ago when mines was wrecked, it got 17 mpg first tank, where as my insight got 50+


Sent from my iPhone using AutoGuide.com App
__________________
Fully Eco Modded 2010 Honda Insight PHEV
Semi Eco Modded 1995 Suzuki Sidekick LJX
Cobb is offline   Reply With Quote
Old 01-09-2013, 10:21 AM   #50 (permalink)
Senior Member
 
Join Date: Sep 2012
Location: Irvine CA
Posts: 519
Default

I'm surprised the Scion only gets 38mpg on the highway, and not closer to the Prius2 economy of 45. Maybe because the Scion is not using the Atkinson cycle.
__________________
OWN: 61mpg Insight (greenercars.org score: 57)
both blue and silver,
and a 45mpg BeetleTDI (score: 47).
theaveng is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Powered by vBadvanced CMPS v3.2.2

All times are GMT -4. The time now is 04:29 PM.



Powered by vBulletin® Copyright ©2000 - 2013, vBulletin Solutions, Inc.

Content Relevant URLs by vBSEO 3.3.2