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Uh oh:
"A different but similarly equipped Insight also beat its EPA highway figure on the same test by 2 miles per gallon, but posted only 47 mpg."
They're quoting a test run on a different day entirely. A 9 mpg delta could be entirely attributable to something as simple as wind speed and direction. (I've seen more than that on I-70 across Ohio in the same car, for instance, where one trip in 2014 returned more than 70 mpg, while last week I got 55 mpg--I had a favorable tail wind on the former).
Unless the intended takeaway is "reality is capricious, unrepeatable, and not applicable to any one user's experience," there's not much to glean from these real-world "tests."
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