No, it's 100 AIR MILE radius from your home terminal, unless you work longer then a 12 hr day. Also, there is another exception to this, if your employer is an interstate carrier, and your only a local (never go beyond 100 air miles) you still have to fill out a log book.
Thank you striker , I used to log everyday on two diff jobs but I was averaging about 300 to 400 plus miles a day.
I can and do work 12 hr days and never go beyond the 100 air mile radius from Denver and still log 300 miles, it happens. BUt since I work for an interstate carrier, I'm required to log it, even though there are times when I will work a month straight in the city.