I wonder what the emission difference between an ultra short commute (4 miles one way) and a longer commute (20 miles each way) is. I would bet that the difference is less than you would think. On the short commute, the engine and cat do not get a chance to warm up, whereas on the longer commute it does. Just a question to ponder.
I am one of those people with a 4 mile commute. I would ride my bicycle but there are a) too many large hills, and b) no proper bicycle routes. Not to say I haven't done it before, but it is scary to say the least. I commute with my DRZ400S. Puts a smile on my face all the way to work (which quickly fades once I get there....). Gets about 65 mpg without trying, the last time I checked.
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