If I only kept log of work related mileage, how can I get review to go thru. I have no record of total miles driven for personal and job related miles?

[DianeW]

Here are some ways to determine your total mileage for a year driven on your vehicle. Be sure to write down your odometer reading now, adjust it back to January 1st for next year with your mileage records for 2018.

1. Oil changes or any car repairs always note the mileage on invoices or receipts, this could provide a very close estimate of your total miles for the year. 
2. You could also use your starting mileage when you purchased the vehicle, subtract that from the current total odometer mileage and then divide by the number of years you owned the vehicle. This would provide an estimate of miles normally driven each year.

You have to complete the entire Business Vehicle Expense interview in order to get to the screen where you elect the Standard Mileage Rate method (if this is what you want to use) .