I've heard many economic people say that if you keep your car for 10 years it will save you enough money to retire sooner.

I'm not sure how much that will affect my personal goals but I still keep them all for 10 years, except for my last Grand Caravan which saw an untimely death.

Efficient drivers do it better.
1003 miles a tank personal record. 74MPG calculated. HCH1 CVT