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Calculate Your Car’s Cost Per Mile
Posted By Jim On 03/24/2008 @ 12:37 pm In Cars | 12 Comments
A few years ago, with my last car, I did a little calculation to help determine the “cost per mile.” I was doing quite a bit of driving back and forth from Baltimore to Pittsburgh, then Baltimore to New Jersey, to visit my girlfriend (now by wife, so I suppose it was worth it :)) and so this number was important for me to know. I also found that it helped make other decisions in my life easier because it gave me a very tangible cost associated with driving somewhere, such as to the gas station across town instead of the gas station on my route home.
The cost per mile can be broken up into three major categories and one catch-all:
So, what’s the final number? The IRS business mileage deduction is 50.5 cents a mile, how close was your value to this one? When I did this calculation a few years ago, I found my value was close to the mileage deduction back then (it was 40-something cents) but that was before the spike in fuel prices. For comparison’s sake, my value for gasoline back then was 7 cents a mile based on a car that was running around ~32 miles to the gallon (Acura Integra and I was doing a significant amount of highway driving).
How do you use this number? Let’s say it’s 280 miles between my home in Maryland and my parent’s in New York. The tolls between Maryland and New York, I believe, are around $60 a round trip. Given the cost of fuel alone (7 cents a mile), the cost of the trip is over $100 compared to the cost of a Southwest flight that can be bought for $39 a round trip. So, driving alone would cost over a hundred dollars and nearly 5 hours – flying would cost ~$100 and 3 hours… it’s a no brainer and the math is facilitated by knowing the cost per mile.
Finally, your car’s cost per mile is only part of the story. In my drives to Pittsburgh or to New Jersey, tolls played an important role and often threw the entire equation out of whack. Back then, the toll for the Pennsylvania Turnpike was around $8 a round trip and nearly $50 a round trip to New Jersey. Another factor was time. I could take a $15 Chinatown bus from Baltimore to Grand Central in NYC, then jump on an Amtrak train out to New Jersey… but it would take me like 15 hours to make the trip and time is money! (and back then, that was time I could spend with my beautiful soon-to-be wife, and yes she reads this blog)
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