For tax purposes, mileage tracking requirements are very limited by IRS (internal revenue service). In mileage logging, you have to enlist the mileage of each trip for each vehicle. For claiming mileage, IRS has eligibility requirements like the type of business.
During the personal use of vehicles, you can’t claim the mileage. It can be confusing for fleet drivers as they take vehicles home every day. You have to make a difference between the miles that you put for work and commuting miles. With the mileage, you should also record the trip date, trip mileage, business purpose, and location you traveled to and from.