I'm using Caltex Silver (93RON) and the ignition timing on my GA13 is already at maximum setting, no more room for more advance setting. The most expensive fuel I've tried before was Petron Blaze but I did not like it for it will leave an orange brown residue on the sparkplugs. I just stick with Caltex Silver, less color dye unlike the 95RON fuel with thicker red dye that will only clog the carburetor.

Quote Originally Posted by poy View Post
hehehe... but advancing the ignition timing more will require a much a little bit expensive nga fuel, like shell v-power o kanang mga tag-as ug octane rating nga gasoline...