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Scangauge version 1 in my car showed 69MPG for the rally. I don't think the number was accurate in the Scangauge. I have a wideband o2 sensor with monitor that show fuel/air mixture in real time. In my Saturn, when the engine restarts during P&G driving, the car computer goes to open loop for 15 to 30 seconds. In the open loop, the mixture is 10% higher than in closed open. Scangauge report the same real time MPG between open and closed loop. The Scangauge in my car was adjusted to my daily drive which around 20% P&G. I the MPG rally, I did 95% P&G. I think the 95% P&G makes the Scangauge report higher MPG number than real.
The car is running 1 to 15.8 fuel/air ratio in closed loop and 1 to 14.3 in open loop. I think 63MPG is petty closed to real. This means the number from Scangauge is like 8% to 10% higher than real. This is 69MPG * (14.3/15.8) = 62.5MPG. If we can do start/finish filling next year, I will know the MPG number for sure.
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