Home office without deduction

[Tony Tibbar]

There are lots of articles explaining the rules for home office deduction.
None of the apply to my situation because:
a] I have no dedicated area.
b] The desk, computer, etc are also used for personal use.

Those things won't change in the near future.
So, this topic is not about filing for home office deduction because I'm not even considering it.

The reason I want a home office is to deduct mileage.
I live in a small town (12,500). Few yards outside the city limits.
I'm a flipper and want to deduct all my business trips in and out of town.
Or should I say "Metropilitan area".

So I want to know how my house can qualify as 'Home Office' for Mileage deduction without ever filing for the Home Office deduction.
In other words, How do I tell/prove IRS I have a home office?