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peacecyal8r

Regular vs Premium Gas

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Just purchased the new 2017 Reserve AWD MKZ and love the car but the manual tells me it runs on 87 octane gas but in order to get the full horsepower on other sites it says to use Premium Gas.  Back in the day, I read something that stated unless it says run the car off of premium gas in the manual its is a waste of money.  What say you forum :)

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Mods pls delete I posted in the wrong section

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My MKZ is the 2.0 and I use the 87 octane and haven't had any issues.

Don't know on the 3.0. Just try the 87 first until almost empty then try the 93 and

See if you feel any difference in the MKZ.

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Mods pls delete I posted in the wrong section

No need to delete.  I'm moving the post to another forum.

 

WRT your question, first which engine do you have?  The Turbo engines will run just fine on regular but will not develop their full rated hp.  You may see worse MPG on regular, as the ECU will pull timing on the lower octane fuel.  The 2.0 develops 231hp on regular vs. 240 on 93 octane.  IDK the exact figures for 3.0 AWD but IIRC, it loses at least 20 hp on regular.  I can feel the difference in mine.

 

What applied "back in the day" no longer does as smaller, turbocharged engines proliferate.

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