Should I be saving our more expensive car?

So my wife has a ford and I have a bmw. We mainly use my bmw as it is newer and nicer but despite it being newer it has 3k more miles on it. Should we use the ford more often to save the bmw or just enjoy the nicer car… You only live once?

3k miles difference? Completely inconsequential. Simply drive the vehicle you enjoy the most.

What's the point of having a nicer car, but then being afraid to drive it?

Drive the BMW, enjoy it. When you die, do you really want to look back and be glad you saved your BMW from a bit of depreciation, by not using it?