How Consumer Reports tests cars:

Acceleration

Acceleration tests are conducted on a smooth, flat pavement straightaway at the track. The test car is rigged with an optical road-scanning device hooked to a data-logging computer. This equipment creates precise records of time, speed, and distance for sprints from 0 to 30 mph, 60 mph, and for quarter-mile runs. For trucks and heavier SUVs, we also perform acceleration tests while towing a weight-loaded trailer. Good acceleration speaks to more than the fun factor. It's also vital for executing safe highway merges and plays a key role in some accident-avoidance situations.