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I have a 2015 Lincoln MKC with the standard 2.0 ecoboost engine. Is their any benefits to gas mileage if I switched from regular to premium unleaded. Anyone else have any experiences?
 

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The short answer would be no benefit in mileage.

The energy content in gasoline is the same in regular or premium fuel. Premium fuels contain antiknock compounds necessary to prevent pre-ignition in higher compression engines. As long as your engine runs well without pre-ignition the factors of other variables that effect mileage have a far larger impact. It is best to use "top-tier" rated fuels as they do contain additives to improve overall ignition but most "top-tier" fuels have similar, if not same, additives in both regular and premium blends.
The gasoline Marketing machine has done an excellent job in convincing the mast majority of the public on premium advantages, but like a vast amount of Marketing, it's bunk..........
 

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would premium fix any knocking issues at startup
What kind of knocking issue? Direct injected engines tend to be a bit noisy at start-up. Is that what u hear?
 

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I really doubt there is compression induced knocking related to octane in these cars. All modern motors are programmed to run just under the spark advance/fuel mixture that would cause knock- one knock from the sensors, and it backs off. This is the most efficient and powerful tune of any engine.

So to get the most horsepower the motor does need that higher octane. I run premium when I tow with my 2.0L because the horsepower for hill climbing and merging is a big deal then- despite the thirst it has with 3000 extra pounds.

When you see that you are 'throwing your money away" buying premium, it is more a comment that few drivers need that full power very often when putting around town or the highway. But when you truly demand the power it can be there.

Older cars had to be tuned with all sorts of compromises and assumptions, and the high compression/ large spark advance muscle car era demanded good juice all the time.
 
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