Originally posted by PerlOfWisdom
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You have to maintain the average speed difference for 9 1/3 miles to save yourself a minute.
It's so easy to lose any advantage that you gain. You hit congestion, and it's all gone. Those cars you overtook overtake you on the inside. Once you hit a 30mph busy town, you might average 20mph if lucky. If that falls to 18mph, every one and half miles you lose a minute.
I used to commute 100 miles each way. I found that home to office, if I stuck around the legal limits, maintained lane discipline,, drove defensively and just relaxed a bit, I tended to arrive within just a few minutes as when driving aggressively, switching lanes, avoiding speed cameras. And far less stressed. Even improved my mpg.
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