Seafoam

[mirapatec]

Just to add a little more to this old thread, I have been using Seafoam, as well. I have added half a bottle to the fuel tank at every oil change (three oil changes as of today), and really cannot notice any big difference. However, since my Yaris only has 15k miles on it, and using quality gasoline and Seafoam twice already, perhaps there is not that much carbon to burn out. I suppose this could be considered preventive maintenance.