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I think you had a math error on the $4.50 column, but I like where you're going with it since the average American keeps their primary car for roughly 100,000 miles. A little more if it's a man, a little less if it's a woman based on stats, but still a good midpoint. Here's what I came up with:For every 100,000 miles
Gas $3.50 $4.50
MPG
10mpg $35,000 $87,500
15mpg $23,000 $57,000
20mpg $17,500 $43,750
25mpg $14,000 $35,000
30mpg $11,666 $29,165
MPG = Miles per US gallon
Values in USD
To me, this demonstrates why 30mpg compact cars like the Chevy Trax or Hyundai Venue are still pretty good value in a world where the new Prius can run you $10k more. Over the course of 100,000 miles, even at $4.50/gal gasoline, the Trax/Venue would cost you $6000 more in gas, but still end up having saved you money versus paying a $6k+ premium for the Prius.
However if you're shopping a new Venue against an old 15mpg 4WD truck with oversized tires, then a $25k Trax would be equal in total cost of vehicle+gas to a $10k used truck, plus of course that $10k truck will end up costing you thousands more in repairs and maintenance, showing some of the false economy of old, low MPG used cars.