I've been using it for about a month but still don't understand how to block it. Eventually I get it to block, but I have no idea what I'm doing to get it blocked. Easy to unlock! My gas mileage hasn't decreased at all (there have been concerns about evaporation if it doesn't seal properly, but it doesn't appear to be). In general I am very satisfied. Maybe over time I'll figure out how to block it on the first try. There were no instructions included.
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