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At least with diesels, first click method is useless, there is way too much foam and amount of foam varies from fillup to fillup, so only method that works somehow, but not 100% is to fill so that you slowly put last 2 gallons in and then fill up to neck, so that you can see level of fuel, this of course is then car related if it is possible to do so or not.
1 click method can have variance of 2 gallons in my car (diesel), so that is not always well working method.
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