Mileage Deduction

[Rkra]

I have a consulting business/sole proprietorship.  I have a home office 11 miles away from my primary client.  I visit the client about 1 - 2 times per week and I deduct the round-trip mileage.

For the next few months, I will be working about 180 miles away from the client, but I still have to visit their site about 1 time per week.  Can I deduct the 180 mile trip (plus tolls) or am I limited to the 11 miles which is the distance from my office to the client?

[ee-ea]

Deduct the 180 mile trip (plus tolls) because that is the travel you have to do.