My accountant made me keep a record of miles traveled for work and then for personal business. He was then able to calculate how much the company SHOULD be charging me to use their property. If it is you vs your company on a matter like this, the entity with the good records will win.
On a related matter, if you do not have a CPA (NOT H&R Block--I used them twice and the horrorible service pushed me right into the arms of a competent CPA) doing your taxes, you might want to consider doing so. The 200 bucks mine charges me saves me the time and hassle of having to do them myself, he finds deductions I never knew existed, and will back me up in case of an audit. Plus, the 200 bucks is a deduction for next year so it all comes out in the good.
