Well, it's easier during the summer and fall months to live without a car. I live in Georgia where the weather, unfortunately, is rather unpredictable. Generally, however, the summer and fall months are pretty moderate, enough so that riding my bike would not be too terrible in order to get to work. The main reason I get such long stints on a single tank is really just do to the tiny amount of driving I do per week. I drive to and from work daily, which is only about 10 miles round trip and then I go to the grocery store, maybe once per week. Other then that I might take the occasional trip to my girlfriends house which is maybe 7 or 8 miles away and that's about it. In reality, my car only gets between 20 and 30 mpg. I live on my college campus which is in a pretty commercial area so everything I need to live can be found within a 5 mile radius easily.
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