Does distilled water make a big difference? And is there a trick to getting consistent measurements? I'm using the tester mentioned above in the Lethal Performance link. On 3 consecutive tests over a 15-20 minute period, I've gotten 94%, 100%, and 89%. I filled about 1/4 of a 2 gallon gas can over at the Kroger on Old Denton. I brought it home and used tap water from the sink. I'd expect slight variations in consecutive measurements, but these are all over the place.
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