IRS mileage may be deducted for trips made for business purposes. Talk to your tax professional about the details but generally speaking, the commute from your office to your a work- related errand or meeting is deductible. It is also deductible if you have a home office. See IRS publication 463 for information.

http://www.irs.gov/publications/p463/index.html

If you deduct travel, entertainment, gift, or transportation expenses, you must be able to prove certain elements of the expense. For more detailed informaiton see IRS publication 463 below.

http://www.irs.gov/publications/p463/ch05.html#d0e6290

A daily record of some kind such as an account book, diary, or similar record is required as well as its documentary evidence such as receipts, canceled checks, or bills. Exceptions: Documentary evidence is not needed if your expense, other than lodging, is less than $75 or for expenses where a receipt is not readily available e.g. like a parking meter.

How to prove expenses Recordkeeping (IRS Publication 463) http://www.irs.gov/publications/p463/ch05.html
Recordkeeping (IRS Topic 305) http://www.irs.gov/taxtopics/tc305.html

Historical IRS MIleage rates: http://www.irs.gov/taxpros/article/0,,id=156624,00.html

"Tax Savvy for Small Business" by Tax Attorney Frederick W. Daily is a Nolo Press classic. It is updated every year to be your easy to understand guide to the current tax code. But don't take just OUR word for it the Washington Post says "This book is one of the best plan-language books on small-business taxes" It was also named a "Top Tax Book" by Entrepreneur Magazine. http://www.nolo.com/products/tax-savvy-for-small-business-SAVVY.html

Travel, Entertainment, Gift, and Car Expenses -(IRS Publication 463) - http://www.irs.gov/publications/p463/index.html

Car and Truck Expenses (IRS Publication 583) http://www.irs.gov/publications/p583/ar02.html#d0e1688

Business Use of Car (IRS Topic 510)http://www.irs.gov/taxtopics/tc510.html