So presumably you're going to use up some of that $ 430,000 no matter what and you should be looking at the difference and seeing how long the payback period is. (money.stackexchange.com)
Longer payback periods mean you are spending too much money on customer acquisition. (entrepreneur.com)
Vehicles with lower annual miles would typically experience longer payback periods, up to four or five years, but would still reap cost - savings. (transportation.gov)