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Updates...
Yesterday I did the much needed oil change after a seafoam treatment and added a bottle of system 48 to the oil (oil treatment, reduces friction etc). Instantly I noticed my MPG is a bit higher when driving 55 (while performing the system 48 treatment run). Drove it to work and ran it 55 most of the way, averaged 47mpg which I could only touch if I went 45mph the whole distance before. The trip home I hit a new record for my self at 51.5 mpg with temps around 55. On that trip, the first 1/3 I could bearly hit the high MPG mode, so I had an average of around 42 at my turn north. From then on I was in the high MPG mode and was seeing instant MPG of 55-62 and was much easier to keep it in the high MPG mode than normal. I also added the 2nd half of my lower block for the trip home so that had a factor as well (last record was with it in at warmer temps).
The High MPG mode seems to be the same condictions, map sensor reading of under 7.0 and trans in 4th w\ lockup.
The last couple of times turning off the car when parking I noticed the idle is higher than before, probably from such a huge change the ECU needs to relearn the idle (which I am never doing except for coasting). I still don't know why the car gets better mpg when in this mode, either it is running lean, or maybe the EGR is being activated or stuck open.
Again, the only differences from "normal" mode and the higher mpg mode is the timing. To get into the mode I have to go 45mph, let off the gas to about map reading of 5, and re apply to about 6.0-6.6 to maintain speed. Timing reads around 23-25. In "Normal" mode, at map readings of 6.0-6.6 it is about 20% lower MPG at a given speed (which is normaly slowing down) and timing says 38 to 40
Just a side note on the sea foam treatment (my dad did it for me), he said he smoked out the area, and when he took it for a drive, it stopped smoking in about 4-5 miles.
With some aero mods I hope to hit the top 10 list for % over epa and highest mpg cars (60mpg = 130.8% over epa)
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