If you could chose to increase the average fuel economy of a car, which of these would save the most fuel?
1. 10mpg -> 12mpg
2. 12mpg -> 15mpg
3. 15mpg -> 20mpg
4. 20mpg -> 30mpg
5. 30mpg -> 60mpg
It turns out they all save the same amount of fuel.
If you travel 100 miles:
100 / 10 = 10 gallons used
100 / 12 = 8 1/3 gallons used
10 – 8 1/3 = 1 2/3 gallons saved
100 / 30 = 3 1/3 gallons used
100 / 60 = 1 2/3 gallons used
3 1/3 – 1 2/3 = 1 2/3 gallons saved
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