Well with all this sorry gas the govt has put on us, we need to run the engine more to keep it from forming the gunk around the injectors orfice and cleaned. That may not be enough, but that is I am doing. I run the genset for about 45 min on a load, then I run the MH motor almost the same time. I willhave to replace the gas that I ran out before we head out. But all this input is very good information. I think I will go back and write it all down and make a check sheet out of it. BTW I will never put anything in my gas tank except gas. The last 2 time I added something to it, I had to replace the O2 sensors both times.