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If you are keeping the key on the whole time then you're obviously not losing the connection. This still does not account for the fact that not every auto manufacturer reports the injectorpw correctly. I also know that the estimated fuel economy is approximate because I worked on the math used for several OE's. They gave an acceptable range in their spec and it was 15-20%. We tested it and just scaled the values slightly so if you did the math manually you'd be in the same ballpark. This means if you're trying some special technique and showing a difference it may or may not be real - it may just be tricking the simplistic model. This is why my reliance is more on the old school method of measuring the litres used.
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