Driving vs. Walking to work

I just did the math. According to this, its more economical for me to drive to work than it is to walk. Driving: 0.5 miles x 5 days = 2.5 miles/week ÷ 20 mpg = 0.125 gal/week x $4.00 /gal = $0.50/week x 2 trips (morning & evening) = $1.00/week…
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