As I recall about $25-30/month. I remember wanting a slightly used '65 Mustang, priced in the $2300 range as I recall, but settled on a used '62 Grand Prix Pontiac for $1595 and a payment I could actually afford. A very long time ago when the Big Three Auto car designs were very distinctive in styling.Can you remember how much your 1965 car payment was? My '66 Mustang was $66/mo.