The Environmental Protection Agency (EPA) defines various classes of automobiles, which is used to compare fuel economy.
Vehicle selection: weight <= 8,500 pounds
Automobiles are divided into:
(1) passenger automobiles
(2) nonpassenger automobiles (light trucks)
Passenger Automobile Class
seating for 2 passengers only
interior volume index < 85 cubic feet
IVI >= 85 cubic feet and < 100 cubic feet
IVI >= 100 cubic feet but < 110 cubic feet
IVI >= 110 cubic feet and < 120 cubic feet
IVI >= 120 cubic feet
small station wagon
IVI < 130 cubic feet
midsize station wagon
IVI 130 cubic feet to < 160 cubic feet
large station wagon
IVI >= 160 cubic feet
• The interior volume index (IVI) is the sum of volumes for the passenger and storage compartments.
• Volumes are expressed to the nearest 0.1 cubic feet.
Nonpassenger Automobile Class
small pickup truck
gross vehicle weight rating (GVWR) < 6,000 lbs
standard pickup truck
GVWR >= 6,000 to <= 8,500 lbs
GVWR <= 8,500 lbs
special purpose vehicle
GVWR <= 8,500 lbs and not fitting any of the above descriptions
• The cutoff for small vs standard pickup trucks was 4,500 lbs prior to 2008.
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