I am in the process of trying to finish up my taxes for the year and I'm unsure how to report business mileage.

I have a full-time job, a part-time job, and also run a business. Although my business is run from my home, I do not have a room or portion of my home completely dedicated to this business. My home office is also shared as a storage area and is occasionally used for things other than business. Here are some scenarios that I am wondering about:

I leave my home office in the morning to go to my full-time job. Over my lunch hour I meet with a client and return to my full-time job. After work, I go directly home and do more work from my home office.

I leave my home office in the morning and go to my full-time job. After work I stop by a client's residence for a housecall and return to my home office and finish up paperwork.

I leave my home office in the morning and go to my full-time job. After work I go to my part-time job. After leaving my part-time employer, I stay the night with a friend.

I leave my home office in the morning and go to my full-time job. After work I go to my part-time job. After leaving my part-time employer, I return home, but don't do any work from home.

What portion of my mileage can I deduct as business mileage? All of the work I perform is outside city where I reside. If I stay the night with a friend, do I need to document this and would any expenses related to this be deductible?

A final couple questions... do you have any advice as to how I can maximize my business mileage? Nearly all days I am working several jobs, all of which require a considerable amount of driving. Any tips for keeping logs of this? I just started my "side" business this year, but it has grown quickly, and I would like to keep bullet-proof records for it.

Thanks!!

Any help?

Thanks!