I would never own a convert but highly recommend the Dodge Challenger. Love my 2015 SRT 392.
Sits on a Mercedes C class chassis, 500hp hemi, 288 kph so far, vicious 6 piston brembo brakes, put it in eco mode (yes it has one) and when it shifts into 8th, 7L/100 km.
The extra weight and wheelbase...