This Could End Many Discussions...

[RUFFSTUFF]

Originally Posted by Wattz

But I'll stick with manufacturer recommended fuel octane.

Barring modifications, I think that is a good idea.

[Wattz]

My original post was all from memory. If the link worked (it's the full manual), you could see that the section before that mentions that the engine may knock at times and that it's normal for it to do so occasionally. That's where my engine knock statement came from.

Considering that premium fuel would exacerbate cold start problems (regardless of the root cause), I think Ford's general statement regarding premium fuel stands well enough on its own. These small engines are designed for fuel that burns easily. Using a higher octane is working against the design.

[RUFFSTUFF]

Originally Posted by Wattz

My original post was all from memory. If the link worked (it's the full manual), you could see that the section before that mentions that the engine may knock at times and that it's normal for it to do so occasionally. That's where my engine knock statement came from.

Considering that premium fuel would exacerbate cold start problems (regardless of the root cause), I think Ford's general statement regarding premium fuel stands well enough on its own. These small engines are designed for fuel that burns easily. Using a higher octane is working against the design.

Engine knock normal? Ughhhh. Not to pick hairs but premium fuel is not going to cause engine knock. Not a general statement (at least what you posted) as cold starting relates to a specific time in the cars' operation.

Definitely agree that running premium fuel in a low compression motor designed to run regular gas is not going to make it run better... but with less power and perhaps lower efficiency. Unless, of course, it is a Ford motor that knocks occasionally, so I supposed Ford would have you run tap water...