Depreciation isn't really a factor to me, if I used it vs purchase price of my saturn, it would affect my cost per mile by less than $0.01 / mile at this point. If you bought a $10k car a month ago, drove it 1k miles, and wanted to figure total cost per mile, after one month It would be figuring $10/mi from the purchase price alone. After a year or 2 that affect would be reduced but still there. I thought the point of figuring cost per mile was to help determine when switching to a different vehicle would become cost effective, if you figured in the whole purchase price right away, it would never make sense to buy a newer car that cost anymore than a current required repair on your current vehicle
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