I've always heard the same as your tax man from various sources. What I've been told is that the best way to prevail in an audit is to keep a continuous record of odometer readings. A very quick search lead me to a great tidbit on "How to Log Mileage for Taxes in 8 Easy Steps".
http://www.investopedia.com/articles/taxes/090316/how-log-mileage-taxes-8-easy-steps.asp
Here's the critical part, but I recommend anyone with any doubt read the whole thing:
"4. Maintain Driving Log (If Needed)
If you choose the standard mileage deduction, you must keep a log of miles driven. The IRS is quite specific on this point:
At the start of each trip, the taxpayer must record the odometer reading and list the purpose, starting location, ending location, and date of the trip. At the conclusion of the trip, the final odometer must be recorded and then subtracted from the initial reading to find the total mileage for the trip.
This log must be maintained regularly. The IRS does not care for ballpark figures."
Anyone can print out a Google maps itinerary for any trip, but that doesn't prove you actually drove that. Ongoing, consecutive odometer readings, along with business purpose and who you visited, is considered solid documentation.
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