"Just run gas from "Top Tier" rated stations and you won't need a cleaner."
We usually run Chevron, and tried Shell for awhile but switched back to Chevron as both cars seemed to start pinging earlier than usual. Regardless of gas they eventually start to ping, and I need to use a fuel system cleaner. MMO or Gumout of any type doesn't seem to work for either Taurus, only Techron. We're probably getting close to worst case though, with a lot of short trips and driving up and down the hill that we live on.