Fuel

[Bikeman315]

So what is the threshold for high compression? I would say a Mustang GT with Gen 3 Coyote which has 12:1 compression is a high compression engine and does benefit from the higher octane gasoline

You are correct. 12:1 is certainly considered to be high compression but it not the same as Hi-Comp engines of the past. EMS prevent the type of damage we would have incurred if we tried using regular gas in our old hot rods. And you are also right about the Coyote "benefiting" from High Octane. We all agree and Ford has already said that. Where the constant argument comes in is whether regular 87 will harm your Coyote. The answer in day to day driving is no. If you're balls to the wall at all times the Coyote would certainly appreciate 91/93.

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[lacanteen]

We're just a bunch of car guys who over obsess about everything.

I resemble that!