IS IT POSSIBLE
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Captain
Joined: Feb 2008
Posts: 514
Likes: 3
From: CT
IS IT POSSIBLE
Is it possible to run on 91 octane rating on stock hemi without super chips? Have you done it before and if you have done refilling stock hemi with 91? Could you provide me information about how it runs on 91 octane rating and its mpg/performance?
Thank you for your time.
Thank you for your time.
Rookie
Joined: May 2007
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From:
RE: IS IT POSSIBLE
all that 91 would do is just clean your injectors good. i don't know about the hemi but my 4.7L runs good on 91 octane. i never run it more than 3 tanks because it has caused mine to run rich in fuel.
Champion
Joined: Aug 2007
Posts: 4,702
Likes: 2
From: N. Florida
RE: IS IT POSSIBLE
Sure, you can use 91. You can use 93, but it isn't necessary unless you are running a chip. I usually use 89, but sometimes I'll mix 1/2 a tank of 89 with 1/2 a tank of 93. That should average out to 91. I'm not sure if it runs any better, and I haven't checked the mileage. Fact is, I haven't taken it on the road since I bought it. That'll change in April, when we go to the G2G in Orlando.
Record Breaker
Joined: Jan 2007
Posts: 2,451
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From: CA
RE: IS IT POSSIBLE
ORIGINAL: rammindodge03
all that 91 would do is just clean your injectors good. i don't know about the hemi but my 4.7L runs good on 91 octane. i never run it more than 3 tanks because it has caused mine to run rich in fuel.
all that 91 would do is just clean your injectors good. i don't know about the hemi but my 4.7L runs good on 91 octane. i never run it more than 3 tanks because it has caused mine to run rich in fuel.
If you want to keep your fuel system clean then go to Top Tier gas stations like Chevron/Shell. They eachadd their owndetergents in the gas...Chevron adds Techron and Shell calls it something like V-power. The cheaper gas stations don't add detergents..
Rookie
Joined: Aug 2007
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RE: IS IT POSSIBLE
ORIGINAL: SeVeReDiStOrTiOn
Octane isn't a cleaner...it's the fuels resistance to burning/igniting. You only need a higher octane to prevent detonationif you have a high compression engine, running FI of some kind, performance tune that advances the timing/pulls fuel to run lean, etc. 91/93 octane will ignite the same as 89 once the plug fires, so you shouldn't run rich or rough because of the octane unless you're talking about race gas.
If you want to keep your fuel system clean then go to Top Tier gas stations like Chevron/Shell. They eachadd their owndetergents in the gas...Chevron adds Techron and Shell calls it something like V-power. The cheaper gas stations don't add detergents..
ORIGINAL: rammindodge03
all that 91 would do is just clean your injectors good. i don't know about the hemi but my 4.7L runs good on 91 octane. i never run it more than 3 tanks because it has caused mine to run rich in fuel.
all that 91 would do is just clean your injectors good. i don't know about the hemi but my 4.7L runs good on 91 octane. i never run it more than 3 tanks because it has caused mine to run rich in fuel.
If you want to keep your fuel system clean then go to Top Tier gas stations like Chevron/Shell. They eachadd their owndetergents in the gas...Chevron adds Techron and Shell calls it something like V-power. The cheaper gas stations don't add detergents..
Veteran
Joined: Sep 2007
Posts: 281
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From: Middletown, RI (originally Nebraska though)
RE: IS IT POSSIBLE
Hemi's "require" minimum 89 octane, read the owners manual. I believe the only way to reap the benefits of a higher octane fuel is to advance the timing of the engine, aka, some type of tuner.
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Captain
Joined: Feb 2008
Posts: 514
Likes: 3
From: CT
RE: IS IT POSSIBLE
i see but i still want to know what is the mileage when you use the 91 octane rating and so on.....
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Veteran
Joined: May 2007
Posts: 330
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From:
RE: IS IT POSSIBLE
I used to run 103 octane race gas in my Honda whenI took it to the track. I had to fill it up in a gas can because the gas station didnt want to have any liability. I did it so I could advance the timing and play around with 1/4 mile times (improved only 1/10 of a sec). You could put 91 in your truck no problem but w/o a tune i would highly doubt you would ever see a noticably difference in power or MPG.
Champion
Joined: Aug 2007
Posts: 4,702
Likes: 2
From: N. Florida
RE: IS IT POSSIBLE
I have a suspicion that the fuel cost/mile is better with higher octane, but I don't know for sure. I get about 14.2 mpg with 89 and my normal driving routine. If 91 gets me 14.7 or better, the fuel cost per mile is better than 89. Like I said, I'll know more after the G2G in April. I expect to go to Orlando on a tank of 89 and come back on a tank of 91 (if I can buy 91 there -- I may have to do a mix of 89 and 93 like I sometimes do here). Not super-scientific, but it's the best I can come up with considering no access to dyno and a wind tunnel 
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