I would suggest the ScanGauge. Nothing makes the foot lighter then watching the MPG's go down. Plus unless you get the older style cruise control (holds the gas steady rather then the speed) you'll see better results without cruise.
But it all depends on if your foot can handle the long drives.
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Adjusted for my driving habits. 80%city/20%Highway.
20mpg city/30mpg highway or bust! Check out my mods so far
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