Okay, after re-reading, I took my actual cost per mile in gas ($.21), added MMM's oil, tire, and miscellaneous (about a penny per mile each) to give me $.24/mile.
Have I correctly followed MMM's approach to depreciation? ... I bought an 06 Scion xB with 83,500 for $8400 a couple weeks ago. Hoping it will last 100k more. So, 8400/100,000=.084 means my depreciation is 8.4 cents per mile?
Any other costs to figure into a per-mile cost? Insurance is elsewhere on my sheet at its actual cost.
Thanks for the help!