You and should title the truck in the LLCs name, but it won't be a sale because you can't sell to yourself.
Vehicle mileage depreciation:
https://www.irs.gov/publications/p463#en_US_2017_publink1000298667
By the way, ATX calculates this correctly as depreciation.
Yes, you can pick and choose mileage vs. actual by vehicles, but you can't use mileage for 5 or more vehicles.