Not too familiar with Florida traffic, but I get better MPGs in stop and go than highway in the PDX area by driving the average speed of traffic (let gaps form when it's faster and close the gaps when it slows down). The whole point is to minimize brake use. It adds about 30 seconds to a 1hr commute driving that way.
You might replace the spare tire with a plug kit/inflator. It won't help you if a wheel gets damaged or something punctures the sidewall, but it should cover 90% of leaks.
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