And I still have pinging! I have a 1996 Ford Explorer V8 5.0L with 107,000 miles. I bought FP60 almost a year ago and I just finished the gallon of FP60 and my truck still pings on WOT and when going up hills. After hearing all the positive comments from some people after just a few tanks of gas, i figured I would see some improvment after a gallon/year of use, but there really hasn't been any improvement. Pinging is still the same and mpg is about the same. Truck seems to run just a strong as it did a year ago. All other maintenace on the truck is up to date. MAF has been cleaned in the past and the plugs are not that old. How do i know if FP60 is doing anything? Should i continue to use FP60 and will it eventually clean the chambers enough to get rid of or lesson the pinging? Just trying so see if FP60 is benefiting me and justfy the purchase of more FP60. thanks for all the help.