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7/8/2020 3:01:36 PM
Posted: 8/31/2015 10:18:44 PM EDT
[Last Edit: 8/31/2015 10:19:14 PM EDT by focus8]
I've filled up with regular and haven't noticed anything, the manual says 87 is okay but 89 octane is preferred. Am I going to blow up my new truck?
 
Link Posted: 8/31/2015 10:25:07 PM EDT
No, the computer will "listen" for engine knock and retard special education the timing, resulting in less power and lower gas mileage.
Link Posted: 8/31/2015 10:26:36 PM EDT

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Originally Posted By guitardudester:


No, the computer will "listen" for engine knock and retard special education the timing, resulting in less power and lower gas mileage.
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Sounds like I should be using midgrade
Link Posted: 8/31/2015 10:30:06 PM EDT
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Originally Posted By focus8:

  Sounds like I should be using midgrade
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Originally Posted By focus8:
Originally Posted By guitardudester:
No, the computer will "listen" for engine knock and retard special education the timing, resulting in less power and lower gas mileage.

  Sounds like I should be using midgrade

Might as well use 87. Who knows how long the other stuff has been sitting in their tank.  I've always assumed it has degraded and possibly soaked up extra moisture.
Link Posted: 8/31/2015 10:33:38 PM EDT
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Originally Posted By guitardudester:
No, the computer will "listen" for engine knock and retard special education the timing, resulting in less power and lower gas mileage.
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First post fucking nailed it!!!
Link Posted: 8/31/2015 10:36:12 PM EDT
Maybe I should see if premium helps mileage. I've been averaging 19-20mpg with restraint on this tank
Link Posted: 8/31/2015 10:37:21 PM EDT
I always use 93 and add sta-bil, my trk sits for 5-6 weeks at a time without starting, have had no issues.
Link Posted: 8/31/2015 10:55:39 PM EDT
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Originally Posted By focus8:

  Sounds like I should be using midgrade
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Originally Posted By focus8:
Originally Posted By guitardudester:
No, the computer will "listen" for engine knock and retard special education the timing, resulting in less power and lower gas mileage.

  Sounds like I should be using midgrade


Particularly in hot weather.
Link Posted: 8/31/2015 10:55:43 PM EDT
In before 'the manual says I should run 87 but I get more power and better mileage with 93.'
Link Posted: 8/31/2015 10:57:12 PM EDT
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Originally Posted By focus8:
Maybe I should see if premium helps mileage. I've been averaging 19-20mpg with restraint on this tank
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It wont. If the engine is not designed for premium it can not take advantage of its properties
Link Posted: 8/31/2015 11:02:09 PM EDT
[Last Edit: 8/31/2015 11:03:47 PM EDT by imq707s]
Originally Posted By focus8:
I've filled up with regular and haven't noticed anything, the manual says 87 is okay but 89 octane is preferred. Am I going to blow up my new truck?  
View Quote


So you spend multiple thousands on a new truck.....but you can't afford to spend a few cents more per gallon to run the correct fuel that the manual calls for?

Run what the manual says.  Yes, the computer will retard the timing a little if he hears knock, but it can only pull so much timing out.  And you are going to get less mpg and less power.  I believe the manual says run at least 89 octane...no less.
Link Posted: 8/31/2015 11:02:41 PM EDT
[Last Edit: 8/31/2015 11:06:40 PM EDT by GoRebels]
2014 Ram 1500 here and running cheap ass 87 all day.  Avg MPG is 15 and cant tell a fuking lick of difference between that and mid grade.  It's a fucking dodge it'll eat shit all day.  As to the retarded knock'n, google Hemi Tick.  These bitches knock from the factory
Link Posted: 8/31/2015 11:05:23 PM EDT

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Originally Posted By imq707s:
So you spend multiple thousands on a new truck.....but you can't afford to spend a few cents more per gallon to run the correct fuel that the manual calls for?



Run what the manual says.  Yes, the computer will retard the timing a little if he hears knock, but it can only pull so much timing out.  And you are going to get less mpg and less power.  I believe the manual says run at least 89 octane...no less.
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Originally Posted By imq707s:



Originally Posted By focus8:

I've filled up with regular and haven't noticed anything, the manual says 87 is okay but 89 octane is preferred. Am I going to blow up my new truck?  




So you spend multiple thousands on a new truck.....but you can't afford to spend a few cents more per gallon to run the correct fuel that the manual calls for?



Run what the manual says.  Yes, the computer will retard the timing a little if he hears knock, but it can only pull so much timing out.  And you are going to get less mpg and less power.  I believe the manual says run at least 89 octane...no less.




 
It doesn't imply that it has to have one over the other. I'm not walking down to the truck to find it and take a picture right now.
Link Posted: 8/31/2015 11:07:44 PM EDT
Driven hemi dodges for the last 9-ish years. Never anything but the lowest octane, cheapest petroleum based swill I can find. Never any problems.
Link Posted: 8/31/2015 11:08:32 PM EDT
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Originally Posted By shadowmaker1969:
In before 'the manual says I should run 87 but I get more power and better mileage with 93.'
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That or "nothing but the best for my baby."
Link Posted: 8/31/2015 11:10:51 PM EDT
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Originally Posted By focus8:

  It doesn't imply that it has to have one over the other. I'm not walking down to the truck to find it and take a picture right now.
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Originally Posted By focus8:
Originally Posted By imq707s:
Originally Posted By focus8:
I've filled up with regular and haven't noticed anything, the manual says 87 is okay but 89 octane is preferred. Am I going to blow up my new truck?  


So you spend multiple thousands on a new truck.....but you can't afford to spend a few cents more per gallon to run the correct fuel that the manual calls for?

Run what the manual says.  Yes, the computer will retard the timing a little if he hears knock, but it can only pull so much timing out.  And you are going to get less mpg and less power.  I believe the manual says run at least 89 octane...no less.

  It doesn't imply that it has to have one over the other. I'm not walking down to the truck to find it and take a picture right now.


It's perfectly fine to run it. Modern ECM/PCMs and their associated sensors do a damn fine job. Just less power/mileage, though at only midgrade, it might not make much difference at all. Even turbo cars these days can run 87 just fine (caveat: on stock tune and turbo) without trouble, even here in the hot ass desert.
Link Posted: 8/31/2015 11:11:19 PM EDT
I love threads like this. 87 actually has the most "power". 93 is the least sensitive, so it can withstand higher compression before detonation. Use what the manufacturer says. Putting higher innwont help if it wasn't designed for it.
Link Posted: 8/31/2015 11:12:32 PM EDT
i've got the charger hemi, mid-grade all day... company pays tho

in awd i average 12mpg combined
in rwd only i average 17 combined

on the highway in rwd at 55/60 i can average 34mpg depending on the terrain, at 75 i average about 25
Link Posted: 8/31/2015 11:13:12 PM EDT
2014 Ram owner and I never have paid any attention. I just buy gas when the gage tells me I'm low.
Link Posted: 8/31/2015 11:17:55 PM EDT
87 193K miles, runs like a champ
Link Posted: 8/31/2015 11:31:01 PM EDT
[Last Edit: 8/31/2015 11:31:34 PM EDT by focus8]
Nevermind
Link Posted: 8/31/2015 11:33:01 PM EDT

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Originally Posted By shadowmaker1969:


In before 'the manual says I should run 87 but I get more power and better mileage with 93.'

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I have a buddy who used to run 103 race gas in his stock 88 Civic cause he thought higher octane = more power.



 
Link Posted: 8/31/2015 11:39:30 PM EDT
I used to use 89 until I reprogramed my chip for high performance requiring 91 or better. Never had any engine issues either way.
Link Posted: 8/31/2015 11:50:46 PM EDT
Here in the high country mid-grade is 87 and low grade is 85 Octane.   My Hemi(s) run fine on 85 or 87 Octane.
Link Posted: 9/1/2015 12:04:04 AM EDT
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Originally Posted By SeanTX:
Driven hemi dodges for the last 9-ish years. Never anything but the lowest octane, cheapest petroleum based swill I can find. Never any problems.
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Me too
Link Posted: 9/1/2015 12:09:09 AM EDT
I have a 2013 Hemi 5.7 Ram 1500 with 392 gears in the ass end.  I drive the shit out of that truck and average 15-16 on ethanol gas.  If I run real gas I get a little better mpg.
My wife gets around 18-19 mpg but she drives like a freaking girl
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