Performance of a 1960's Mustang?
the 65 to 69 classic Mustangs with v8 only get 15 to 19 mpg on the highway and lots less in town, that's because they didn't have fuel injection and overdrive transmissions...
However if these thing are added they can get comparable mileage and performance..
I won't go into comparing them to a modern car in handling..
One thing they don't have is the depreciation of a new car, in fact they appreciate as you fix them up..