While the Audi E-Tron is a standout, its gas-powered counterpart, the Q8, is plenty impressive in its own right. The two cars are remarkably similar, so the Q8 earns the same high marks for technology and active safety, and then adds a dollop of performance for its potent V8 engine. The main difference between the Q8 and E-Tron’s scores, though, is down to the gas-powered model’s disappointing fuel economy.