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Don't worry, I don't believe you are trying to trick me on the AFR.
One thing you gotta consider with running lean is that you need to reduce your load. Big wings, wide sticky tires and the like will have a large negative impact. The more power you need to make to propell your car down the road, then the more fuel you need. That's why I can do so good at only a 17:1 AFR.
Even though I see mid seventies while cruising, I can average just above 50mpg on my regular commute, so you also need to consider the way your drive, the route you drive, etc...
The key ingrediant will be the Instant MPG Gauge. Without it, you will never get your tune right for best mpg while lean. Right now you are just guessing at all of your parameters and they can not even be educated guesses because there is not much of a knowlege base for running this lean. I'd suggest you get an MPGuino imediatly, back down on your AFR and focus on learning how to get a more convervative AFR. You are more likely to suceed this way and learn how to make a tune that works will with lean AFR's.
If your able to tweek your injector pulse widths and timing on the fly, you can just monitor an instant mpg reading and you will know exactly what parameters are needed.
Hope this helps!
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