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10-29-2018, 07:23 AM | #1 |
Drives: 2018 LE 5DR A4 Join Date: Aug 2018
Location: Canada
Posts: 23
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Is idling factored into fuel consumption reading?
Does anyone know if fuel consumed during idling, either in Park or at full stop when in Drive, is factored into the reported average fuel consumption readings?
On our 2018 the current/instantaneous reading drops to an absolute 0 in both cases so I'm wondering if they include that consumption in the average/trip reading? |
10-29-2018, 08:28 AM | #2 |
Drives: 2007 2-door hatchback Join Date: Jul 2016
Location: USAnotCA
Posts: 750
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Zero IS the correct liters/mile reading when the motor is running and the car isn't moving.
edit: oops. meant to write miles/liter. (It's always been miles/gallon for me here in the states, and never had any fuel efficiency instrumentation besides a gas gauge.) Last edited by dogsridewith; 10-29-2018 at 05:09 PM. |
10-29-2018, 09:00 AM | #3 |
Drives: 2018 LE 5DR A4 Join Date: Aug 2018
Location: Canada
Posts: 23
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That would be true it were Miles per Gallon, 0 being the "worst possible" (when idling).
But liters per 100km flips that on its head, where >15 (or however high the meter goes) is the "worst possible". When the car's instantaneous reading drops to "0" at a stop light, thats not "correct" (if it were, this would be the most efficient car ever made: consuming 0 liters of gas every 100km :) ). Incidentally, the reading also drops to 0 when DFCO is active, and indeed for those few moments that really is true (since fuel is effectively shut off). So the question still stands: does the trip average ignore fuel consumed during idle, or does it factor it in as fuel consumed during the trip (distributed over the total kms traveled)? |
10-29-2018, 11:49 AM | #4 |
Drives: 2007 2-door hatchback Join Date: Jul 2016
Location: USAnotCA
Posts: 750
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Your question is a good one. Liters/100km should read infinity when stopped and idling.
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10-29-2018, 01:24 PM | #5 |
Banned
Drives: 2015 Yaris LE 3door 1F7 Join Date: Feb 2017
Location: Massachusetts
Posts: 963
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the new yaris still burns gas when idling it has no start stop just has an average idle kick on and off type deal.
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10-29-2018, 02:06 PM | #6 |
Drives: 2009 5-door, 5-speed Join Date: Sep 2011
Location: White Rock BC
Posts: 687
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I'm not sure what values the trip computer reads to calculate from. Eg: If they used the injector duty-cycle, they would have a very accurate measurement of actual fuel going in at all loads. But due to fuel quality/density differences, maybe it's more accurate for it to read other values and calculate from there.
You could reset your display, then do a bunch of throttle-snaps. If it were injector based, it should show up there. Also keep in mind that Idle and DFCO may be closer to 0 L/100km than 1; and rounding down because of it (DFCO does still use some fuel). |
10-29-2018, 03:39 PM | #7 | |
Banned
Drives: 2015 Yaris LE 3door 1F7 Join Date: Feb 2017
Location: Massachusetts
Posts: 963
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Quote:
edit anything above 80 is like 18-22mpg |
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11-01-2018, 07:54 AM | #8 | ||
Drives: 2018 LE 5DR A4 Join Date: Aug 2018
Location: Canada
Posts: 23
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Quote:
The question is whether said gas is factored in to the TRIP AVERAGE fuel efficiency. Quote:
I dont know, but I suspect that the trip figure is simply an average of the short-term interval readings (the "skinny bar graph") since the last reset. If I'm right, that would include those bogus "0" readings while idle (which might actually be read by the computer as 0, OR it might just be displaying 0 because "infinity" would confuse most people :) ). Last edited by sunsanvil; 11-01-2018 at 08:09 AM. |
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