THIS IS IMPORTANT - PLEASE READ
I work in a professional non-aviation job.
I had to spend a while away from home, on and off for 6 months, but only about 120 kms from home.
The boss paid me $70 a day extra to cover my driving there (wouldn't cover it now!) this appeared on my group certificate at LAFH allowance.
So technically I didn't get my expenses paid for, however I got an allowance.
Went to the accountant. He found a ruling that said along the lines of if you are forced for work to work away from home and don't receive expenses (eg. hotel / meals), you can claim approximately $175 PER DAY WITHOUT RECEIPTS! (can't remember the exact figure but it was very large)
Yes, it's true. Needless to say I was wrapped and picked up $7k on my return.
If this even remotely applies to you, PLEASE check with your accountant, it may be worth it.