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Old 05-29-2013, 09:59 PM   #1 (permalink)
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Gas burned per minute spent idling figures?

Googled it and only found anecdotal data from 1/2 to 1 gallon per hour idling.
Do you know of more accurately tested figures for different cars?

I believe consumers should push for car magazines and gov't to test and publish such results.

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Old 05-29-2013, 11:23 PM   #2 (permalink)
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If you have instant MPG reading capability, then coast in neutral with engine idling until your reading drops below max gauge capability.

In my 2002 Insight the speed was 16 MPH when the instant MPG gauge dropped below the max reading of 150 MPG. I divided 16 by 150 to come out with idle consumption of .11 GPH.

.5 GPH for most V8s
.33 GPH for most V6s
.25 GPH for most 4 cyls.

These are average numbers but can vary considerable depending on engine displacement and idle speed. Adding loads like AC can increase it substantially.

I used to tell people that my Insight would go 40 MPH on the same fuel a V8 used to just idle itself (.5 GPH and 80 MPG at a steady 40 MPH (CVT not manual)).

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Old 05-30-2013, 08:19 AM   #3 (permalink)
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According to my gauge, my Toyota Celica GTS with the 2ZZ engine uses between 0.21 and 0.26 Gallons Per Hour idling when warm, depending on the number of electrical loads I have on or off. (Mainly the difference is lights at night.) Fuel consumption idling cold is significantly higher.
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Old 05-30-2013, 09:50 AM   #4 (permalink)
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My 2.0L Hyundai Elantra is ~0.34 GPH on a cold engine cold winter day, and ~0.25 GPH after warmed up.
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Old 05-30-2013, 10:32 AM   #5 (permalink)
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I thought...

That I could pull up some good solid research from here. Alternative Fuels Data Center: Case Studies
But the best I could do was B/S for dummies I believe would be my best description. None of the test results or base line graphs Id expected just stupid stuff like starting a car takes energy lol. I am exaggerating somewhat but look for yourselves. Our GOV.
heres a widgets page mabe some nugget hiden here? Alternative Fuels Data Center: Widgets
I am thinking I may find better info on the CARB site though.
I am sure the fed is just suckling off of Ca. ground breaking discoveries and plans now.

Carb also has naught for passenger vehicles but thier Index is awesome tons of stuff for bored eco minded surfer to explore. http://www.arb.ca.gov/html/all.htm.

Last edited by justme1969; 05-30-2013 at 10:41 AM.. Reason: nunya
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Old 05-30-2013, 10:56 AM   #6 (permalink)
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My car (2.0L Neon) = up to 0.50 GPH idle when cold, as low as 0.28GPH warmed up. Probably 0.32 GPH average after warmed up, though.
Wife's car (1.5L Scion) = ? cold, as low as 0.14 GPH warmed up.

W/o scangauge or similar device, it's hard to say what you'll get.
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Old 05-30-2013, 11:45 AM   #7 (permalink)
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.42 GPH stock and now I got it down to .39 GPH still not very good for a 2.0L

This is one part in my application I have not been able to improve on very much. Low compression turbo engines use a lot of fuel at idle
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Old 05-30-2013, 01:09 PM   #8 (permalink)
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One thing I noticed... When I cleaned my IAC (Idle Air Control) unit, I kind of "broke" it... after I reassembled it and forced it back into position, startups went 1.5K RPM down to ~700, where prior was up to 2.5K and down to around 1.3K until warmed up. Was holding .5GPH idle, now doing about .43 w/ the lower rpm.
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Old 12-26-2013, 09:36 PM   #9 (permalink)
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2013 GMC Seirra 5.3 with no acc on in park. I recently measured at 1.919 LPH after a thorough warmup from a stone cold start. The fuel burned to get the engine warmed up is mind bogling at a total of 3 Liters in 18 minutes. Where a hot engine would only burn 0.58 liters in the same amount of time.
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Old 12-27-2013, 12:35 AM   #10 (permalink)
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Quote:
Originally Posted by ssnsvibe09 View Post
2013 GMC Seirra 5.3 with no acc on in park. I recently measured at 1.919 LPH after a thorough warmup from a stone cold start. The fuel burned to get the engine warmed up is mind bogling at a total of 3 Liters in 18 minutes. Where a hot engine would only burn 0.58 liters in the same amount of time.
1.919l = .51 gal U.S.

3l = .79 g

.58l = .15 g, or

.45 to .5 gallon/hour idling when warm
.8 gallon during 20 minute warm-up from cold

This is useful to me because there is a sea of V8s autostarted and idled around here for 6 months out of the year. Now I can attach some numbers to it all- probably a gallon for each autostart event because it is plain to see most last longer than 20 minutes; and 1/2 gallon per hour from then on, like at the local parking lots.

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