17. Triumph Stag
Triumph presented the Stag from 1970 until 1978. The market was impressed by the new model featuring open-top driving with the hardtop. It still had enough room for four adults and all their luggage. The Stag was powered by a 3.0-liter V8 engine delivering 145 HP for decent performance. With its muscular appearance and V8 rumble, the Stag looked like a luxury muscle car, attracting many buyers.
Unfortunately, it wasn’t long before most Stag owners experienced its notorious unreliability. That, along with its high price, destroyed any chances on the American and global markets. When they ceased production in 1978, Triumph had produced just 25,000 cars.