Seriously guys and gals, good gas or fuel is a big issue. Using cheap gas can be expensive, but if your going to do it anyhow, use a good fuel system cleaner on a regular basis. In 1989 an oil additive company i worked for tested various fuel cleaners in an effort to market thier own. About 2 million dollars later, they found that only "techron", made and patented by Chevron, was the ONLY effective fuel additive on the market. All other "cleaners" were refined derivitives of kerosene, and effective only in mild cases. I hate to plug a product, but I saw the research. Good Luck. P.S. Other companies buy techron to use in thier products but its so expensive they dont use enough of it to be effective.