Thanks a lot, KC.
"But make sure that he understands that he still has to keep good records. In fact, in an audit, they are going to want to see repair bills to help substantiate the mileage reported." This is the first thing we cleared up after every submited tax return and before sitting for the next one.
After a short discussion, it was decided to go on with the actual business expenses reporting as the client is okay with this.
Funny but he is kinda man who likes to call the stuff with their real names, you know
I must have missed that I.R.B. 10-51. In the same time this Techniques Guide is very useful indeed - the last revision of pub 917 I found was from 1995.
Once again, thanks for sharing and sorry for the late post.
Case closed.