I have been always using Hess or Victory fuels when filling up my 91 Crown Vic. Just recently did the fuel system cleaning with the Techron concentrate. I just did one treatment of that and started using the 87 octane Chevron/Techron gas. It's interesting that I noticed virtually no pinging and the engine runs smoother. Experimented with Shell gas with the same positive results. It seems like the Chevron does a better cleaning. Out of curiosity I ran a tank of Hess 87' octane and experienced some pinging. Went back to Chevron 87 octane, no pinging and smoother running.
Anyone else experience this too? Is Chevron a top tier fuel?
Anyone else experience this too? Is Chevron a top tier fuel?