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jsus

2.5L Hybrid
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AFAIK, all US gas at commercial pumps is unleaded.

OP, you didn't say what vehicle you have, but if it's a Hybrid, all you need is 87 Octane, per the user manual. You might take a little time and actually read it. Lostsa helpful info in there.
Finally been phased out globally as of a couple years ago...

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whizwart

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Owner's manual covers this.

Ecoboost; Premium 91+.
Hybrid; Regular 87+.

The Ecoboost is a high compression, direct inject, turbo charged, engine. If you use less than 91+ (per the owner's manual) you can induce knocking. Over a long period of time this is horrible for the engine. This isn't just for Ford's Ecoboost line but any engine of this type.

The hybrid engine is also rated at a high compression but it is an Atkinson cycle and has an effective lower compression ratio. As such, you can use Regular fuel in it just fine and it likely won't see any gains with Premium.
 

LSchicago

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I will use 87 unless crossing the Rockies while towing or something, then I will us 93 (Or 91 if that's as good as it gets where I am). Only my Mustang & 455 Cutlass gets the good stuff. The rest are non performance vehicles that can run on piss gas.
 
 




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