Makes sense.
Here the story is completely different.
The Mustang is the best seling sports car in the world by a margin of at least 2 to 1. The reason is it's popularity in the US.
Now, granted the 4.6 liter engine is inefficient by European/Japanese standards. Normally a high performance Euro/Japanese engine 2/3 that size produces similar power with better mileage.
But, that same engine also operated under much higher stress and pressure, and since gasoline is "only" $3 per gallon here, the big, lazy, torquey V8 is a popular choice. It doesn't have to work as hard to do what it needs to. The demands are simply different.
Also, we aren't taxed based on displacement, power, or CO2 emissions, so those are less important to consumers as buying criteria.
Size is also an issue.
The Mustang is a big car. People don't believe it when they see that it's just as long as a Ford Explorer and very heavy. It's just not a light wieght little sports car. Compared to the average Euro-Japanese car, it's a huge car. But, in this land of SUV's and larger cars (and not such great drivers) I'm more comfotable in a car with some significant mass. I know mass isn't the only decider in an accident, but it makes a difference in deceleration values. The car the wieghs 1/2 as much will be accelerated backwards in a perfect crash.
The interior is "cheap" compared to similar cars overseas, but it has gotten so much better than it was in the previous model. My fully optioned interior is more than adequate for my puposes. But let's not forget one of the real big pieces of the puzzle, price.
For the money (in this country anyway) there is nothing that matches the Mustang's performance and looks for the money. If this car were sold in Europe, through Ford dealers, at American prices, watch the doors crash down. People there want something different, something cool. Many of the cars on European roads look exactly the same, and this car stands out (as will the Camaro and Challenger - wow!).
My father, who was born in Austria, moved to America, but then brought his Oldsmobile back to Europe to tour for a few months, loved every minute of it.
I'd love to do the same someday, but I'll bring plenty of Euros for gas...