Business mileage -how to calculate it more easily advice needed

My husband thinks many business owners end up counting most of their driving as business miles because they’re often on calls or networking while traveling, and almost any stop can turn into a business conversation.

I’m curious how others handle this and what the simplest way is to track business mileage when you own two businesses.

Right now I’m trying to record starting and ending miles and trip purpose for every drive in my phone notes, and it’s becoming a lot to manage. Is it acceptable to estimate using beginning and ending mileage for the year and then subtract a reasonable personal portion, or does the IRS really expect detailed records for each trip?

Also, if you forget to log miles for a few days, is it okay to combine them into one entry?

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