Re: C 12 side note
All fuel checks rely on proper handling and test procedures to be accurate. Things such as ambient air temps, beaker temps, contamination from the air or from equipment that hasn't been cleaned, calibrations that haven't been done or haven't been done properly.
And there are some brands of race gas that, although they advertise consistency, aren't really as consistent as they need to be batch to batch. Sometimes they won't pass even right off the truck.
Just be sure fuel samples are taken with great care, keep the samples out of direct sunlight at all times, and make sure the tested temperature is correct.
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