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Old 09-30-2010, 09:53 AM   #1 (permalink)
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Driving to consumption vs. driving to load

I keep seeing mention of driving to load, but there are cars like the civic and newer gms that utilize lean burn, and this fuel saving technology is not load specific. I submit that whenever possible, driving to consumption lets you find and stay in lean burn much longer, and thus save more gas. I also found out that mu cruise is configured to stay in lean burn as long as possible.

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Old 10-01-2010, 09:33 AM   #2 (permalink)
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I agree.

Actually "driving to consumption" is probably a better way of describing what I do when I say I'm "driving with load" (DWL) anyway (even though I don't have lean burn).

I almost never have the "LOD" value displayed on my ScanGauge - when I'm focused on DWL, I'm actually watching instant fuel consumption (MPG).

What newer GM's have lean burn? So far the only documented cars I know of that use it are Honda and some Fords (search for Escort lean burn here).
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Old 10-01-2010, 02:34 PM   #3 (permalink)
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Ecotecs do it, and some v8s. The u haul truck I rented had it, and do does my ion.
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Old 10-01-2010, 03:17 PM   #4 (permalink)
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The scan guage II in my 2007 Yaris displays Intake air temp, because I use exhaust manifold heat to heat the intake air, Coolent temperature, Throatle position switch, and LHK Liters per 100km, instintaniouse fuel consumption. The readings I use for FE are TPS and LHK. I have the option of load but never found it helpful because of my poor understanding of how to make it usefull to my driving for FE. When in cruise control on the highway if the TPS goes to 17 with a hint of engine bracking I know I can depress the clutch and coast down the hill at idle without having to tap the brake to kick it out of cruise... When I depress the clutch by mistake before the apropriat conditions prevail what the engine does is raise RPM about 600rmp then stay at that RPM for about 15sec then goes to idle, or it stays at the RPM it was at in cruise for 15seconds then returns to idle. Its interesting what our mestakes teach us...

Last edited by redyaris; 10-01-2010 at 03:26 PM..
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Old 10-01-2010, 03:52 PM   #5 (permalink)
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Holy typos, batman, I use fuel flow in gph to find lean burn, tps is redundant, imo, since you should know where your footy is on the throttle, unless you are looking to avoid, let's say, 80% throttle, but still, gph is your best friend in efficiency hunting, shooting for the lowest flow is ideal
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Old 10-01-2010, 03:56 PM   #6 (permalink)
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Holy typos, batman, I use fuel flow in gph to find lean burn, tps is redundant, imo, since you should know where your foot is on the throttle, unless you are looking to avoid, let's say, 80% throttle, but still, gph is your best friend in efficiency hunting, shooting for the lowest flow is ideal
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Old 10-02-2010, 01:46 AM   #7 (permalink)
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Hmm... I was aware that the direct-injection GM engines used lean-burn, but I am not aware of any conventional port-injected GM engines that use lean burn (in North America anyway).

For those of us running stoic, watching MAF flow is also a good indicator, as air-mass is directly proportional to fuel-mass when an engine is in closed loop.
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Old 10-02-2010, 04:27 AM   #8 (permalink)
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The guy that tuned my engine said it appeared as though my car was going into lean burn.
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Old 10-02-2010, 05:11 PM   #9 (permalink)
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...look for engines listed as being SIDI (Spark Ignition direct Injection).
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Old 10-02-2010, 08:23 PM   #10 (permalink)
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Where is it said they have to be direct injection to have lean burn?

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