I'm sorry, but I have to disagree with those that use ultra-cheap gasoline. About six weeks ago, when I initially acquired my automobile, I noticed that it was slow to start up with a warmish engine.After three gallons of Shell's premium gas, the issue disappeared.Keep in mind that the fuel system might benefit from the cleaning chemicals included in high octane fuels. After filling up my tank a second and third time with premium gasoline, I plan to go back to the regular fuel. To the best of my knowledge, automobiles exported to nations with lower RON standards are already configured to function properly on the lower quality fuel. What about grocery store items?