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5.0L V8 Technical Discussions Any questions about the 'Coyote' engine, transmission, exhaust, tuners/CAI, or gearing can be asked here!

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Old 04-26-2014, 05:51 AM   #1
HRDWRK
 
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Default Confusion aboout fuel recommendation

Hello:

Based on what I have read here and in auto magazines test drive on 5.0 engine, and based on what I was told at the dealer, premium fuel is recommended for these engines but when I read my 2014 owners manual it has written on page 161 (Octane recommendation) that 87 octane is recommended for these engine except for "sever conditions such as towing"!!
So, what is recommended , what you guys use, for daily driving?!
Sorry but I an a newbie here. I have been trying to read as much as I can. This is the first mustang and to that fact, this is the first Ford!
Sorry about my title typo "aboout"!!. Too much coffee at 4 am!! jumpy fingers while typing!!
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Last edited by HRDWRK; 04-26-2014 at 06:37 AM.
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Old 04-26-2014, 05:57 AM   #2
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You can use 87 or 93 octane and everything in between.
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Old 04-26-2014, 07:42 AM   #3
jz78817
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the engine will run fine on 87 for normal driving but may not make rated power if the PCM has to pull back ignition timing.

I run 93 and don't worry about it. it's like 20 cents more per gallon, BFD.

Quote:
Sorry about my title typo "aboout"!!. Too much coffee at 4 am!! jumpy fingers while typing!!
Oh, I thought you were Canadian.
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Old 04-26-2014, 08:45 AM   #4
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I don't mind the extra cost of the premium ( after all we bought a 5.0 to enjoy it) but if the stock car doesn't need it, why waste the money!
It is just very strange that a manufacturer make the car with certain performance specifications and then recommends a fuel which doesn't support the delivery of that performance. It has not even mentioning anything like "premium fuel is recommend but you can use 87 which may affect the performance of the car", or something like that.
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Old 04-26-2014, 09:11 AM   #5
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Quote:
Originally Posted by jz78817 View Post
the engine will run fine on 87 for normal driving but may not make rated power if the PCM has to pull back ignition timing.

I run 93 and don't worry about it. it's like 20 cents more per gallon, BFD.



Oh, I thought you were Canadian.
^LOL!
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Old 04-26-2014, 11:22 PM   #6
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87 octane robs you of 10 hp, use 93....
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Old 04-27-2014, 01:31 AM   #7
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I run 93 but I have had my car tuned for 93....
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Old 04-27-2014, 02:22 AM   #8
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The 3.7 & 5.0 both have DOHC w/ adjustable timing, the copperhead ecu can tell 87 or 93 octane and will perform accordingly.
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Old 04-27-2014, 01:24 PM   #9
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Just out of curiosity, has there been a dyno with 87 versus 91 (or 93) octane fuel somewhere? What would be the affect on torque?
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Old 04-28-2014, 05:19 PM   #10
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Quote:
Originally Posted by HRDWRK View Post
Just out of curiosity, has there been a dyno with 87 versus 91 (or 93) octane fuel somewhere? What would be the affect on torque?
Uh I am sure there is someplace........

I am not sure you will see much difference in daily driving really. To really see a benefit from 93/87 you would have to get the car tuned for that fuel type.
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Old 04-28-2014, 05:19 PM
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