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i dont get it...I ran my A/F at 17.0 at cruise and I got AWESOME fuel economy.
That is a hell of a deal. My O2 Sensor is bad, and is dragging down my economy something fierce. May want to cycle 50 times to make sure you don't have any reset CELs. Never thought to do the swap to a rex, but that may be pretty cool. If anything ever happens to it and you wanna part it out I call dibbs. God forbid, just saying.
1. Do a coolant flush, clean out with fresh water, drain again, then put new coolant in. Run it for a few minutes, then drain again. Get all the old coolant out of everything. (you should do a coolant flush every year, but nobody ever does.)
2. Change/clean the airfilter.
3. Replace sparkplugs with new one-step-colder sparkplugs.
4. Drain the engine oil, and once it stops dripping, pour a quart of fresh synthetic through. Put fresh synthetic oil in the engine, change the filter while you're at it.
5. Lean out the fuel map from about 35kpa to 80kpa to about 17:1 A/F. Set tip-in to richen the mix .5 to 1.0.
5. (optional) You'll probably want to keep a wideband in the car, but leave a switch on the display so you don't look ricer-ish.
These steps got me to about 60mpg in a 1999 hatch over the summer a few years back. I was driving about 110 miles a day, 80 of those were highway at a nice average of 100mph. I've done this with about 5 cars for people who drive a lot of highway, and they've enjoyed the benefits quite a bit. One person (the only one I'm still in contact with) has put over 100k miles on their 1996 civic ex with that tune/configuration.