Personal ground vehicle
A personal ground vehicle (PGV) refers to any vehicle that is privately owned, and intented for transport over ground.
Several vehicles are used for personal transport purposes: Automobiles, electric scooters, segway PT's, Toyota winglet's, bicycles, recumbent bicycles, cabin cycles, velomobiles, motorised and human powered steps and monowheels, inline skates, heelys, ...
A kart is a 4-wheeled motor vehicle used for transporting a passenger, which also carries its own engine or motor. They are designed to be used solely on constructed roads, have seating for 1 person and do not allow goods to be transported. Karts have minimal safety features and are not designed for comfort or protection from the weather. They are not generally used for personal transport, but rather for competition and demonstration.
In some competitions such as the Shell Eco Marathon, average car weights of 45 kg have also been achieved with karts.  As well as low weights, the small size and low profile result in make low wind resistance easy to achieve. The resulting lower fuel use can be up to 2560 km/l .
A "car" (or "Automobile") is is a 4-wheeled motor vehicle used for transporting passengers, which also carries its own engine or motor. They are designed to be used solely on constructed roads, have seating for four people and also allow small amount of goods to be transported.
A minivan is a 4-wheeled motor vehicle used for transporting passengers, which also carries its own engine or motor. They are designed to be used solely on constructed roads, have seating for 1-8 people and also allow small to very large amount of goods to be transported. The amount of people/goods to be transported influence each other; ie with only 1 person to be transported, the amount of goods that can be transported can be very high; or alternatively, the exact opposite can also be done (a lot of people, little goods can be transported). A relatively good ecologic minivan is the E-jeepney.
Weight is a very important aspect of a PGV, influencing fuel consumption and performance. General weight estimates are as follows:
- compact motor carriage: 1500 kg to 2250 kg
- mid-size motor carriage: 2250 to 2700
- minivans: 2500 to 3500 kg
According to a research conducted by Julian Allwood of the University of Cambridge, global energy use could be heavily reduced by using lighter cars, and an average weight of 500 kg has been said to be well achievable.
 Cradle-to-cradle design
An example of a C2C kart is the ECO One, made by Warwick Manufacturing Group, University of Warwick
Examples of C2C motor carriages are the Ford Model U, the new Jeep Renegade, Edag light car, CQS Group T Racing Team Pegasus (see http://www.cqsgrouptracingteam.be/nl/odyssee/doelstellingen_o ), Joe Harmon Design Splinter, ...
 Special features
Some manufacturers such as The Naro Car Company have very small cars (ie Naro) designed to allow more cars to drive the streets. Other cars are the foldable car from MIT Media Labs, the adaptive suspension car (CLEVER) invented by Benjamin Drew (see http://royalsociety.org/CLEVER---Compact-Low-Emission-Vehicle-for-urban-transport/).
Some open-design cars have been designed. These generally encompass electric cars (ie OScar, C,mm,n, Riversimple Urban Car), but some open design cars also use a conventional IC engine. Examples of such manufacturers are Local motors and Mobius Motors
- 45 kg as average car weight in Shell Eco-Marathon
- http://news.nationalgeographic.com/.../110418-pictures-shell-ecomarathon-2011/ Shell Eco-Marathon car weight]
- Andy Green's 8000 mile/gallon car
- compiled by F.G. Fowler and H.W. Fowler. (1976). Pocket Oxford Dictionary. London: Oxford University Press. ISBN 0-19-861113-7.
- http://cars.lovetoknow.com/How_Much_Does_My_Car_Weigh Average car weight]
- Possible global energy reducstion