Register a free account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members through your own private inbox!
gas without the cobI found that to be true also with 91 cornless. For those of you that would like to try it, here is link to stations in US & Canada that sell cornless gas
Pure-gas.org - ethanol-free gasoline in the U.S. and Canada
Pure-gas.org is the definitive web site listing stations that sell pure gasoline in the U.S. and Canada.www.pure-gas.org
Same here. I run 87 if I’m not towing heavy
Owners manual doesn't say you "can" run 89, it says 89 is the recommended octane for optimal performance. Only reason you are able to run 87 is due to the knock sensors allowing the PCM to detect detonation and pull timing to prevent serious problems. And even with that, several in this thread, and many others throughout the forum, report audible detonation when using 87. Which isn't good for the engine
For what the owners manual is worth, it does not say any of the things you assume. It does say that the engine is "designed to meet all emissions regulations and provide satisfactory fuel economy and performance when using high quality unleaded gasoline having an octane range of 87 to 89." In other words 87 is fine to use. It does not say that the truck will struggle to retard the timing and you are destroying your engine using 87. If yours says that, please put it up.
^^^^^ This sums it up fine.
No assumptions, and you pretty much repeated what I said as your post went on. Even verified that the owners manual does in fact say what I said about 89 being recommended for optimal performance. Even saying that the PCM retards timing in order to use 87 octane. Not overthinking anything. Just actually know how the PCM operates and how octane levels work.For what the owners manual is worth, it does not say any of the things you assume. It does say that the engine is "designed to meet all emissions regulations and provide satisfactory fuel economy and performance when using high quality unleaded gasoline having an octane range of 87 to 89." In other words 87 is fine to use. It does not say that the truck will struggle to retard the timing and you are destroying your engine using 87. If yours says that, please put it up.
It goes on to mention at the end that 89 is recommended for optimal performance. This being better than satisfactory performance in some way. Two points is not much difference in the gasoline world. If it was, race fuel would be 94 octane and call it good. As you know it is much higher because the detonation happens much earlier in race engines.
You are far overthinking a mass produced vehicle made to meet the different driving habits and conditions from grampa at sea level in Florida to Jonnie Hotrod in Denver. It covers a pretty broad spectrum.
On a forum you hear much more negative griping than positive talk. Most come just to find answers to problems. I would believe that yes, .00001% of the trucks produced might ping or have a need for 89. It is probably good if towing a load. The pcm likely adjusts the timing to accommodate this. If normal day to day driving is ok on 87, then everything is good using it. You can rest assured that the world will not end if you use 87 octane gas.
If you want to spend more on 89 because it gives you the warm and fuzzies, do me a favor. Please use ExxonMobil as this is the energy stock I own the most of.
Many people understand how octane levels work and how the pcm advances timing to account for the slower burn of the more expensive gasoline that is not needed under normal driving. I pointed out that nothing is said of the timing being retarded, you are the one that theorized this on your own. I typed this a little slower so it is easier for you to read this time.
So you are saying the PCM is somehow smart enough to advance timing for higher octane(not true) but doesn't retard timing based on knock sensors for lower octane? Do you hear yourself talk?
Saying it does not retard when it is not needed. You know, like when running perfectly fine on regular gas. Just because you got a POS lemon that knocks, pings, shakes and rattles does not mean all do.
No nonsense. Just seems I understand how the PCM works better than you. It never "advances" timing beyond the factory tune, and will only advance timing if LTKNK was reatrding timing due to knock issues.Saying it does not retard when it is not needed. You know, like when running perfectly fine on regular gas. Just because you got a POS lemon that knocks, pings, shakes and rattles does not mean all do.
Do you even understand your own nonsense? Like I said, if ya got it burn it. It might make you feel better.
