Just drove my 300C to Carlisle and back. 1,100 miles. Ten years of similar trips. Nothing but regular unleaded. 14-16 MPG. Zero problems. It's even had several tankfuls of Sunoco's old "less than regular" 86 octane and ran fine. Unless something is done to modify the factory compression ratio this hemi isn't fussy about diet. Jim Krausmann Detroit -------------- Original message -------------- > What is the proper octane fuel for the 392ci 375 HP? (1957 300C engine) > Can anyone shoot me a quick response? > Ed Rode > > > > > [Non-text portions of this message have been removed] > > > > To send a message to this group, send an email to: > Chrysler300@xxxxxxxxxxxxxxx > > For list server instructions, go to > http://www.chrysler300club.com/yahoolist/inst.htm > Yahoo! Groups Links > > > > > > [Non-text portions of this message have been removed] To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Chrysler300/ <*> To unsubscribe from this group, send an email to: Chrysler300-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/