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Old 05-16-2012, 04:25 PM   #38 (permalink)
TheEnemy
The road not so traveled
 
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Join Date: Jan 2010
Location: New Mexico
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The Truck - '99 Nissan Frontier xe
90 day: 25.74 mpg (US)

The Ugly Duck - '84 Jeep CJ7 Rock crawler
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Quote:
Originally Posted by mechman600 View Post
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.
The engine and cat still need time to warm up. If you count emmissions per mile the longer commute would be lower but total emissions would be higher. Its still good to get the car out and do a long drive to get it fully warmed up from time to time for various reasons.
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