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Almost everything in life is a diminishing return and necessitates compromise. Heck, even improving MPGs is a diminishing return. If you could double your MPGs from 10 to 20, the actual fuel savings is much greater than doubling again from 20 to 40.
1000 miles driven @ 10mpg = 100 gallons consumed
1000 miles driven @ 20mpg = 50 gallons consumed
doubling the efficiency saves 50 gallons
1000 miles driven @ 40mpg = 25 gallons consumed
doubling the efficiency again saves only 25 gallons.
I really appreciate the time you spent putting this data together for us Metro.
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