Premium E5 or Regular E10 fuel ? - Ford Mustang Forum
 
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post #1 of 6 (permalink) Old 3 Weeks Ago Thread Starter
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Premium E5 or Regular E10 fuel ?

hey guys, so quick question, hopefully someone can finally clarify this for me. I live in Europe and we have different octane measurements at the pump. So far i've been using what here is 95 (RON) and i think that would be the equivalent of 91 in US.

now the thing is, the 100 (RON) octane premium which is about 95 US i think has E5 gasoline while the regular has E10 gasoline. So which one should i use ? Is it ok to use the 100 (95) one with E5 or should i just stick to regular 95 (91) with E10 ?

now i know the manual recommends 87 (US) which we don't even have here so just wondering if putting in premium would be an issue as i would like as low ethanol as possible.

PS : the car is a 2005 mustang v6.

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post #2 of 6 (permalink) Old 3 Weeks Ago
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Just use your 95 RON gas in the v6.


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post #3 of 6 (permalink) Old 3 Weeks Ago
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Quote:
Originally Posted by 07redstang View Post
Just use your 95 RON gas in the v6.
Agree. I live in Cyprus and I run mine on 95 RON regular. The only other choice is 98 RON super but that's unnecessary because my car's ECU has a 91 US octane tune.


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post #4 of 6 (permalink) Old 3 Weeks Ago Thread Starter
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Quote:
Originally Posted by 07redstang View Post
Just use your 95 RON gas in the v6.
that's what i was using but now the 95 RON has 10% ethanol. that's why i was wondering i E10 is bad for a 2005 model.
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post #5 of 6 (permalink) Old 3 Weeks Ago
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Quote:
Originally Posted by Vicious013 View Post
that's what i was using but now the 95 RON has 10% ethanol. that's why i was wondering i E10 is bad for a 2005 model.
E10 has been here in the US for sometime now. I see no issues.

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post #6 of 6 (permalink) Old 3 Weeks Ago
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Hi vicious13: There is no benefit using a higher octane in your car if it is still factory tuned. Regular gas not exceeding E10 will be fine.

The main concern with gasoline containing over 10% ethanol is deterioration of the fuel system components. And it does produce lower fuel economy. Your 05 V6 will run fine on E10 but not higher concentrations of ethanol.

I mentioned fuel economy. Using a fuel with lower "E" content will result in slightly better fuel economy. However, the cost of using a premium fuel with E5 or regular with no ethanol (if you can find it) costs more than the additional cost to use a little extra gas containing E10. And I'm sure global gas prices have increased slightly this month.

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