I have the cheapy cigarette lighter version. They have the cheaper one (fills a tire in as little as 8 minutes!) and the more expensive version (fills a tire in as little as 3 minutes!) If you have any kind of regular leak, I'd say go with the more expensive one. The cheaper one that fills a tire in 8 minutes also takes 8 minutes to take a tire from 38 psi to 51 psi.
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