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I only have a gallon of gas in my car at any time, its lighter that way (and consequently more fuel efficient)

I keep my weapons full (unless its unreliable that way ex. steel AR mags loaded to 30rds). While you might only need a couple rounds for most encounters (which are rare) it may take a significant number of rounds to put some people down, and if your gun goes click and the threat is still coming ( thick clothing, big dude, PCP, or just darn stubborn) your going to get a real terrible sinking feeling. 2-3 rounds might be enough, but I know if the threat is within the average distance (7yds) I'm not gonna stop shooting until the threat is down, or a more immediate threat appears, which I can't imagine happening in less than 4 rounds.

Plus you might miss.