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You input your engine size when you first plug it in, fill truck up, tell it so, next fill up you compare how much gas you put in to how much it thinks you used and adjust it's number to match how much you really put in. It's was like 4% off with the Malibu, maybe 8% with Stratus. Regardless of what the number say, you can still use it to learn and compare day to day. I can't keep the Stratus calibrated (car issue) worked fine on the Malibu very consistant.
It doesn't adjust for different Ethanol blends so if you change blends you may need to recalibrate.
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