I am aware EFI suggests superior fuel financial system and there are Mercury fix stores all over the place, but that may be of little convenience when stranded twenty miles through the ramp.Also, I do know Mercury's 4-stroke are created by Yamaha (or at least a good part of it), https://charlieggsuy.bloggactivo.com/33729373/5-essential-elements-for-eco-friendly-honda-outboards