Quote:
Originally Posted by sendler
Wiki says US pumps are certified to .3%
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I didn't find that in a search ... can you point me to it , or the source of the claim?
Quote:
Originally Posted by sendler
In the United States, the National Institute of Standards and Technology (NIST) specifies the accuracy of the measurements
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In the U.S. ... NIST can specify anything they like ... but they don't hold the authority ... in the U.S. each of the 50 states have their own Department of
weights and measures ... and each of those have their own standards for testing methods ... enforcement policies ... etc... some are more precise and more strict than others... some have more failure rates than others.
Quote:
Originally Posted by sendler
Why would you be so surprised to find that the computer read out in the Insight would be wrong?
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I'm not ... As I already wrote previously in Post #77.
I think all measurements have a +/- margin or error.
And even if I assumed your 5% reported error rate was itself 100% accurate ... the ~76mpg I've had for the last 1,400+ Miles still gives me more than 72mpg ... which as I wrote previously ... even with dash margin for error , I'm still getting ~70mpg or better without needing to drive "pretty slow"... jamesqf's 71.4 over 120k miles would still be about ~68 MPG .. etc.
Quote:
Originally Posted by sendler
My computer says 58 mpg when the tank fill says 55.5. It is just a computation based on samples of engine load via the MAP sensor. Not nearly as sophisticated as an MPGuino which counts injection on time. But then that has to be calibrated by comparing to... actual tank fills.  |
But the questions I asked in post #93 remains.
What was the method for that 55.5?
What level of +/- error margin was the distance measurement?
What level of +/- error margin was the Gallon measurement?
How much of tire wear is included? ... how much volume change with temperature is included? ... etc ... etc.
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Kansas for example reported they gas pumps in 2006-2007 was :
"the compliance rate for gas pump accuracy was 96 percent"
that's +/- 4%
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