automobiles

Biggest

The largest production car (6 were built) is the Bugatti Royale type 41 (introduced in 1927), which was 22 feet long.

United States automotive industry classification

In the automotive industry, the terms describing size have roughly the following meanings:

Size	Weight, pounds	Wheelbase, inches	Overall length, inches
Subcompact	—	< 100	< 175
Compact	< 3,000	100–105	175–185
Midsize	< 3,500	105–108	185–200
Full size	3500+	110+	195+

United States Environmental Protection Agency classification

For its fuel economy tests, the U.S. Environmental Protection Agency developed a classification of sizes based on a car’s interior volume:

Sedans (based on passenger & luggage volume)
	Minicompact	less than 85 cubic feet
	Subcompact	85–99 cubic feet
	Compact	100–109 cubic feet
	Mid-size	110–119 cubic feet
	Large	120 or more cubic feet
Two-seaters: cars designed to seat primarily two adults.
Station Wagons (based on passenger & cargo volume)
	Small	less than 130 cubic feet
	Mid-Size	130–159 cubic feet
	Large	160 or more cubic feet
Trucks
	Vans, small Pickups	trucks having a Gross Vehicle Weight Rating less than 4,500 lbs.
	Large Pickups	trucks having a Gross Vehicle Weight Rating of 4,500–8,500 lbs.

Japan: Keijidosha

A car size established by the Japanese government in 1949, and since modified from time to time. The name means "lighter" vehicle; they are also called Kei-cars or K-cars. Dimensions were limited to no more than 3.4 meters long and 1.48 meters wide, with an engine with a maximum displacement of 660 cc.

K-cars, especially the earlier ones, got very good mileage, 60 miles per gallon not being unusual.

Resources

http://www.xs4all.nl/~mjs/index.htm An enthusiast's site, with photographs tracing the history of each manufacturer's K-cars.