50% A) Saving money - just graduated from college, got to pay off student loans
10% B) Reducing CO2 emissions - i'm still praying for the "entering a new ice age" theory, not a fan of being hot
10% C) Reducing pollutant emissions (CO, HC, NOx, PM, etc) - anyone who lives in a big city certainly knows the air isn't getting any better
10% D) A fun hobby - gives me more reasons to work on my car
20% E) Other (please specify) - making my car last longer (see A)
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