Yeah, I've heard stories where people got behind a semi truck. The gas milelage display said that they were getting about 40 mpg, and the car was rated for about 30 mpg highway.
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Jack Martin, he taught me all about bio-fuels last summer. Glad to see his video on Instructables.
The gauge he recommended was the ScanGauge. For $170, it can be a worthwhile device for those that want to increase mileage.
Or if you have a laptop you can get an interface box off ebay from China (pirate? in my electronics?) for $30.