Something to consider, 439k miles at 30mpg is is 14633.333 gallons of fuel used.
At a probably low $3/gallon, that's just under $44k in gas alone.
Of course, if reimbursed at the the last year rate of $0.585/mile for 90% of that (the person had to do some personal driving, right?) That's just over $231k in reimbursable miles at the IRS rate.
Let's take the 300 miles / day and assume that's work related. That's $175/day in reimbursement or $877 for a five day work week. Over $1227 for a 7 day week.
The figures are staggering.
It would sure be interesting to see the actual costs for this vehicle's lifespan.