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It depends on how fancy you want to do it.
You can get flow meters for your gasoline line, have an O2 sensor installed in your exhaust, or fit a mass airflow meter in your intake. That's not terribly involved, but it will involve buying these things, and installing them.
Other options include putting your car on a chassis dyno, or using a 4-gas analyzer. Those, of course, are also costly.
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