How long will it take for US to run out of gas depends on definition, gasoline from oil, and reserves, consumption, and transition. US proven oil reserves are about 35 to 40 billion barrels, at current US consumption of about 20 million barrels per day total liquids, with about 12 to 13 million produced domestically, simple division suggests about 5 to 8 years of proven reserves if no imports and no new discoveries, but this is misleading because proven reserves grow with technology and US also has large technically recoverable resources including shale oil estimated 100 to 200 billion barrels, plus oil sands and offshore. US also imports oil, so it does not rely solely on domestic reserves. For gasoline specifically, US will not run out of gas in near future, but easily accessible cheap oil will become harder and more expensive, and transition to electric vehicles will reduce gasoline demand. If you mean US gasoline supply chain running out due to shortage, that is temporary and resolved in days to weeks. So US will not run out of gas completely for many decades, likely 50 to 100 years with new technology, but will gradually shift away from gasoline to electric. So answer is decades to century, not imminent, but cheap gasoline will become less dominant.
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