The Mustang's niche going back to '64 has been an affordable, fun to drive, sporty (not 'sports') car that seats 4. The originals were built on the Falcon chassis, Ford's Camry of the 60's - including the V8's, GTs, and Shelby's.
That's the definition of a Pony car. Some ponies are Muscle cars, some are not. 2011+ is the blurriest line between the 2 Ford has ever produced, and many of us responded by buying V6's.
Some buyers need a lower purchase price. Some lower cost of ownership via higher MPGs and lower insurance. Some bought the V6 for better handling. Some bought the V8 to win at the track or on the on-ramp, or to hear the throaty rumble.
Ford makes a car called Mustang that allows people with vastly different reasons for buying a car to end up in one model. We all bought the original and best Pony car ever made.
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2012 Boss Yellow Blaze, Recaros/Torsen, Cover/Mats
2012 MCA PP Sterling/Lava 1/11/12 Order, 1/17 VIN, 2/19 Sticker, 2/22 Build Date, 2/26 Shipped, 3/16 ETA, Arrived 3/8, Delivery 3/9 (yeah!)
1979 coupe, turbo, Polar White, red deluxe interior, TRX
1967 convertible, Wimbledon White, red interior, Sport Sprint