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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Mon, Jun-16-2008, 07:21:36 PM   #41
thescatman
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Originally Posted by Obioban View Post
good call on the octane, I just added a number 5 on it.

To everyone else, note that his 95 and 99.2 aren't actually higher octane than the gas we get here-- just a different measurement system
Yeah, I think 95ron in Europe is roughly the equivalent to a USA rating of 91 or 92ron. The 99.2 that's available here is a mix with 5% bio ethanol, the M3 seems to run much better with the higher RON rating.... although it did take a few tank fulls before I noticed the difference.
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Old Mon, Jun-16-2008, 07:53:13 PM   #42
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I Pay $ 10 for a full tank where i live
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Old Mon, Jun-16-2008, 07:57:33 PM   #43
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$10??? Jeez... It costs 60 euro to fill my tank (USD $93)
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Old Mon, Jun-16-2008, 09:26:20 PM   #44
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Here he is...
Thanks for the find. Now if this gets resolved by the coils and I achive 26-29 MPG on the highway, I'll ship you a case of beer to your house.

Makes me wonder..I only drive my beater because it averages about 28 on the highway and is an automatic, but if my M could achieve something similar to that- I think I might use it as a DD!!
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Old Mon, Jun-16-2008, 10:28:18 PM   #45
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Originally Posted by Makavelim3 View Post
I Pay $ 10 for a full tank where i live
I envy you. I just filled up at 4.40 a gallon.
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Old Mon, Jun-16-2008, 10:52:43 PM   #46
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But.. the DME will increase the fuel injected due to the higher rpm... its got to or you run into a lean condition.

Unless the DME is also drastically altering/eliminating the spark, it seems to me that if you are suggesting it uses less fuel coasting than during idle, there would be a lean condition.

EDIT: I see the other remarks, so perhaps the DME is removing spark or completely shutting off fuel.
+1, this is the logic that I am stuck on. Can someone confirm exactly what the DME does when coasting? I would assume that most vehicles do not utilize this technology, thereby making it more efficient to coast in neutral.

Please correct me if I am wrong.
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Old Mon, Jun-16-2008, 10:54:55 PM   #47
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+1, this is the logic that I am stuck on. Can someone confirm exactly what the DME does when coasting? I would assume that most vehicles do not utilize this technology, thereby making it more efficient to coast in neutral.

Please correct me if I am wrong.
fuel is injected based on load, ie, throttle position, O2 sensors, etc., not only RPM...

so if you are coasting, no throttle, no load, it trims fuel back
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Old Mon, Jun-16-2008, 10:58:58 PM   #48
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Since I have a vert, I guess one question would be the difference between having the top up versus the top down. I'm guessing its better with the top up, but how much better ?
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Old Mon, Jun-16-2008, 11:14:30 PM   #49
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Since I have a vert, I guess one question would be the difference between having the top up versus the top down. I'm guessing its better with the top up, but how much better ?
only one way to find out: DIY!
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Old Mon, Jun-16-2008, 11:19:28 PM   #50
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You're supposed to have ALL the answers....
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Discussing e46 M3 Fuel Efficiency thread in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)