What Fuel Grade? - Dodge Challenger Forum: Challenger & SRT8 Forums
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#1 (permalink) Old 11-05-2009, 12:05 PM
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What Fuel Grade?

I did a quick search for Octane but didnt see anything worthy.
The owners manual says (if im not mistaken) that you can use 87-91 octane and I thought it said 87 was perferred. I read that others are putting 91 grade in their cars. Is there really any difference? I'm not sure what I should be using. I am in Texas (San Antonio) and it doesnt generally get very cold here if that makes a difference.

Edit: Sorry forgot to add I have a 5.7L R/T

Last edited by Exce; 11-05-2009 at 12:08 PM.
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#2 (permalink) Old 11-05-2009, 01:13 PM
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I have a 09 auto RT - Running 91. Los Angeles, CA. Curious to hear what others are running too.
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#3 (permalink) Old 11-05-2009, 02:59 PM
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I was under the impression the R/T with auto should be middle (89) level.

I know the manual R/Ts have to run 91 since it's stated in the owners' book and on Dodge website.

Manual states:

FUEL REQUIREMENTS
3.5L and 5.7L Engines (with Automatic
Transmission)
The 3.5L and 5.7L engines (with automatic
transmission) are 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. The manufacturer
recommends the use of 89 octane for optimum
performance.
The use of premium gasoline is not recommended,
as it will not provide any benefit over regular
gasoline in these engines.

5.7L Engine (with Manual Transmission)
The 5.7L engine (with manual transmission)
is designed to meet all emissions
regulations and provide excellent fuel
economy and performance when using
high-quality premium unleaded gasoline
with an octane rating of 91 or higher.

2009 R/T Challenger
Bought on Dec 28, 2008


Last edited by Robo; 11-05-2009 at 03:04 PM.
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#4 (permalink) Old 11-05-2009, 03:12 PM
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Quote:
Originally Posted by Robo View Post
I was under the impression the R/T with auto should be middle (89) level.

I know the manual R/Ts have to run 91 since it's stated in the owners' book and on Dodge website.

Manual states:

FUEL REQUIREMENTS
3.5L and 5.7L Engines (with Automatic
Transmission)
The 3.5L and 5.7L engines (with automatic
transmission) are 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. The manufacturer
recommends the use of 89 octane for optimum
performance. The use of premium gasoline is not recommended,
as it will not provide any benefit over regular
gasoline in these engines.

5.7L Engine (with Manual Transmission)
The 5.7L engine (with manual transmission)
is designed to meet all emissions
regulations and provide excellent fuel
economy and performance when using
high-quality premium unleaded gasoline
with an octane rating of 91 or higher.
Oh I must have missed that. Thanks! I gotta fill up in a few minutes. Ill use 91.
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#5 (permalink) Old 11-05-2009, 03:30 PM
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I have been using 89 as per the manual. And I dunno if it really makes a difference, but I started using Chevron with their Techron additive.

2009 B5 Blue R/T Classic Automatic
Loaded
Born 7/28/09
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#6 (permalink) Old 11-05-2009, 04:19 PM
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I have a 6spd manual and I try to get 91+ octane when I can, but as a rule, the station close by me has 87 and 90...I put the 90 in and don't seem to notice any difference than say, ..when I put 92 or 93 in.....

Dodge Challenger & Harley Fat Boy,...it jist don't git no better....
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#7 (permalink) Old 11-05-2009, 04:34 PM
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put in 89 and never use 87 good luck with your challenger
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#8 (permalink) Old 11-05-2009, 04:35 PM
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Dealer gave it to me with a full tank of 87... burned through it(quickly) and filled up with 89 and i noticed a difference in both responsiveness and mpg. This is in Southern California (Redlands mostly) and in an SE.

[2010]Deep Water Blue Challenger R/T Six Speed.
Mods: 18" Rallye Rims, K&N air filter, HURST shifter,Custom Flowmaster Exhaust, Aeroforce gauge in Vent Gauge pod
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#9 (permalink) Old 11-05-2009, 06:35 PM
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I have always used 89 octane in the 5.7 HEMIs I have had - a 300C, Magnum R/T and now Challenger R/T. I found the only improvement filling up with 91 or 93 was greater gas mileage - up to 3mpg more in the case of 93 octane. No performance improvements, however, and a bigger dent in the old wallet.
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#10 (permalink) Old 05-17-2010, 12:41 PM
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oooohh.. man i just filled up my se with premium.........
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