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