Do additives make super unleaded worth the cost?
[QUOTE=Vagabird;406357]I've never experienced pinging on either R12, regardless of what I put in. But I get 47-51 mpg on my RT if I use 91 octane and 39-43 if I use 87 octane. It doesn't seem to me like I'm saving any money with the cheaper gas. :dunno[/QUOTE]
What about additives? In addition to fuel-economy and ping-reducing qualities of super unleaded fuels, don't they contain additives helpful in maintaining the operating efficiency of the fuel delivery system and the cleanliness of the combustion chamber? And -- can your dealer tell if you've been burning lower octane fuel? Like the question on oil & oil filters, does this have implications for warranty service?
I've seen pictures of valves taken out of motors burning regular and premium fuels and could see the difference -- but are those claims real? If you've taken apart a motor -- did you know whether the motor was run on regular or premium fuel?