I've successfully and SAFELY tuned my vehicle to ~9mpg better simply by getting rid of excess fuel under 20% load. As far as catalytic converters, I dont know. An "economy" flash isn't necessary going to be specific to your vehicle tho. If you are interested in tuning as a hobby, buy a hondata setup, get a wideband, and READ READ READ, if you're interested in picking up 2-3mpg on a lightened generalized fuel map, go for it. If 2-3 mpg isn't worth 300 to you, I would just work on the driver mod. I picked up about 6mpg on this mod alone.
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