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I added around 9 degrees of timing in the cruise area, but unfortunately I am not able to get any numbers because I think my lithium ion battery is making the ECU unhappy and cruise control refuses to turn on. I'm going to try putting some ultracapacitors in parallel because I think it has something to do with the BMS cutoff feature causing a momentary drop in voltage.
That said, I took it on the freeway on the section of road where I was getting about 24mpg before, and I held my foot as best as I could so that the display stuck around 25.0mpg...AND THE CAR ACCELERATED! So I think I'm definitely above stock mpg now, which is awesome.
My travel plans look like I'm saying goodbye to the car for half a year, but next time hopefully I get the electrical issues sorted and can share proper results.
Theoretically speaking, if the only thing I've changed is manifold vacuum, I should have gained approximately 3% more mpg, but I am estimating that the stock ignition timing probably was costing like 6% in fuel consumption, so I would not be surprised if I am now getting 26mpg at 60mph on flat land with 10w-60 oil, and when I finally get around to changing the oil to 10w-40 I expect to see 27mpg or more. Not bad for a car that started at <24mpg!
I also feel pretty comfortable saying I've managed to cut idle fuel consumption to around 0.41gph at sea level (the idle isn't steady but it bounces in between 0.37 and 0.44gph), whereas before I was seeing 0.44gph at 5000ft elevation, so I probably have dropped it more than 10%.
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