While waiting for my tuner to arrive I selected Air/Fuel Ratio under "Gauges" and watched it for a while. I figured that this is where I would notice the most difference after the tune, other than how it felt while driving it. It tended to stay around 14.0 and didn't drop much under hard throttle. After installing the Race tune it stayed around 13.5 and would drop as much as 1.0 under hard throttle. I figured they were just programmed to dump more gas in the mix. If I had more data I would know what else they "tweaked"
anyway, the performance tune works great. The race tune worked just as well but seemed to waste more fuel.
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