You can read the Ultragauge manual online, I plugged mine in and was about 5-7% off until I calibrated it, which is super easy to do (The instructions are very intuitive). It takes a little time to get really comfortable with it, but once you are it's an amazing tool. Just make sure to look up how to program in DFCO (deceleration fuel cut-off) as well.
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Nissan Leaf driver? Join me in Team Leaf and feel smugly superior about our MPGe
Current Car: White Lightning
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Retired Car: Betty White
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