Good day folks...
Our 'Cow Boss' has a new 2008 F350 with the V10 and a manual transmission. Fuel is obtained from a farm tank and he uses injector cleaner on occassions. The truck is almost never on the highway and is never driven long distances.

He is complaining about 'ping' when accelerating and notices it more when towing the stock trailer. Does this sound like a fuel issue or does the beast have to see the highway to get cleaned out?