They base it on 1/4 mile times, so I guess quickest.
Sources: AM- Automobile, CC- Car Craft, CD- Car & Driver, CI- Cars Illustrated, LC- Car Life, HPC- Hi- Performance Cars, HR Hot Rod Magazine, MCR- Muscle car Review, MT- Motor Trend, PHR Popular Hot Rodding, PM- Popular Mechanics, RT- Road & Track, SA Supercar Annual, SS- SuperStock, W- Wheels