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I purchased the Prius for 20k and goes 45 mpg. The other car costs 15k and goes 25mpg. What is the formula to calculate how long do I need to keep my car in order to see the saving.

Number of miles traveled: 800miles per month.

Gas price: $4 per gallon

Or how much money would I save each year I keep the Prius?

Thanks

[ADDED] don't worry about other factors such as car resale value

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3 Answers 3