If the old car is average 15mpg and new car is 40mpg

and 30,000 miles per year(130miles*230days a year), the new car will save 1250 gollons of fuel per year. Depends on the gas price, the annaul cost will be $3000 to $5000 more for the old. But this is only an estimate. The actual numbers will be different. The gas price is a factor, but the annual milage is also important. If the car is driven this way four more months, the milage on the car will be 10000 miles more. How much depresciation will cost to its resale value? They are all the factors to be considered.