I'd keep the spare if you're straying more than 15 miles from home. My Saturn had a blowout a couple of weeks ago from something it picked up in the road--tore out an almost half-inch square chunk out of the tire. Fix-a-flat isn't going to help in that circumstance, and because I had the spare in the car, I changed it on the side of the road in no time flat and wasn't even late to work.
Since you're in Sherman Oaks and never see real "cold", you might consider downsizing your battery. You could drop in one that's 25 pounds lighter and still have plenty of cranking amps.
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