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I liked the graphic presentation, but page 20 doesn't seem correct to me. A conclusion about payback is made. I don't believe the 21,000 mile point would payback the initial additional investment of $6190. 8.5mpg improvement would be about 70 cents a gallon not spent. At 70 cents savings per gallon it takes 8842 gallons to save $6190. Say 35 mpg and that's 309,000 miles driven, not 21,000!
Do I misunderstand?
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