Can I deduct these travel expenses via personal milage expense report? MI Single person LLC

I created my MI LLC in March and traveled in April to meet a potential client.  Eventually I did get some work from the client in September.  I don't think I have actual receipts for gas remembering at my previous employer, I just submitted an expense report for milage on my personal vehicle.

 

I used my personal credit card at the time since I did not have a business account.  I have my monthly statements and can get a copy of the bill from my hotel, so I have some paper trail.

 

Would it be best practice to just submit a personal milage expense report to myself and use that as documentation?