This following text precedes a graph.
A hybrid vehicle produces an immeasurable amount of sound idling or traveling at a low speed. Engine power kicks in as it accelerates, creating nearly the same amount of noise as a conventional car.
The graph has mph on the x axis and decibels on the y axis.
The hybrid car starts at zero decibels while it idles and goes to 50 decibels by the time it hits 6.2 mph. From 6.2 mph to 12.4 mph it rises from 50 - 60 decibels.
The conventional car idles at 50 decibels, moves to about 58 decibels at 6.2 mph and then rises to 61 decibels by the time it reaches 12.4 mph.