Using Premium Gas

[bob91yj]

Higher octane also allows the engine to run at its peak timing curve without knock retard.

Curious how this applies to an HO 4.0L Mopar?

Two can play this game.

 

[DEnd]

Other than the early XJ's with the Renix management system, the 4.0L does not have a knock sensor...the engine management system in the "High Output/Mopar 4.0L" has no way to determine/adjust for fuel quality.

Heh... I did not previously know this... That's a pretty darn stable engine then...