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For Scenario 1, the visit to my Mom's was at the beginning or end of the trip.

 

So even if I travel 200 miles to spend 10 days visiting my Mom before traveling 100 miles to my rental to do maintenance for 4 days, then travel 300 miles directly home from there, I can take the mileage starting at my Mom's to the rental plus the mileage from the rental back home (400 miles) .  Correct?

 

In this situation, the daily meal allowance would be 50% of 4 days?