Don't to forget to factor in all the extra gas, parking, and wear and tear on your vehicle. If you can work from home a couple days a week that would be awesome. My dad traveled around the state for work, many days he drove 1-2 hours each way. I helped him one year with getting the taxes organized for his business, the vehicle expense for gas, oil changes, tires, brakes, etc really added up, and that was when gas was $1.50/gal and you could get a oil change for $12-15.
I live in a town that sucks, but is really close to work. I figure I can drive to a better town 1 or 2X a week to go out to eat, shop etc. In your case I would view it as 3 extra hours of work each day + expenses. Compare that to the new salary and see what you think