Renault EVE
Renault unveiled their EVE concept car in 1980. The EVE was built on a Renault R18 chassis, used a supercharged 1.1 L inline 4-cylinder supercharged diesel engine, and had a 0.239 drag coefficient[1]. This engine output a maximum of 50 horsepower[2]. The curb weight of the vehicle was 1,900 lbs[2]. The combination of these traits allowed it to achieve 70 mpg combined fuel economy[2].
Renault EVE+
Expanding upon the previous concept, the Renault EVE+ concept car was revealed to the public in 1983. It used the same 50 horsepower diesel engine as the EVE, but had reduced the curb weight to 1,880 lbs, had reduced the drag coefficient to 0.225, and achieved 63 mpg city, 81 mpg highway[3].
Renault Vesta
While the diesel Renault EVE concept cars were being developed and tested, Renault was also working on their gasoline powered Vesta concept cars. The Renault Vesta was revealed to the motoring public in 1981. It had a weight of 1130 lbs[4], a 0.25 drag coefficient[5], and a top speed of 75 mph[6]. The Vesta's fuel economy is 78 mpg[7].
Renault's next generation of their Vesta concept car had reduced weight and reduced aerodynamic drag, which improved fuel economy and top speed. The 1987 Renault Vesta II weighed only 1,047 lbs, had a 0.186 drag coefficient, a 27 horsepower engine, and was able to return 78 mpg city, 107 mpg highway[8]. Its top speed was over 80 mph[9].
References:
[1] Renault Club. (2007). 1981 – Renault EVE. Retrieved June 27, 2007, from
http://www.renaultclub.cz/1981_-_renault_eve.html
[2] Saxon, D. (1988). Technology and the American Economic Transition: Choices for the Future. U.S. Congress, Office of Technology Assessment, OTA-TET-283. Washington, DC: U.S. Government Printing Office.
[3] Bleviss, D. (1988). The New Oil Crisis and Fuel Economy Technologies. New York: Quorum Books
[4] Parliament, UK. (2003, October). Memorandum by Stephen Plowden: Cars of the Future. Retrieved June 27, 2007, from
http://www.publications.parliament.u...19/319we06.htm
[5] Philippe B. de l'Arc – A coeur vaillant, rien d'impossible. (2007). Aerodynamic Drag, Data for airfoils, Wings, Aircraft, Automobiles. Retrieved June 27, 2007, from pboursin.club.fr/res/aero.xls
[6] Parliament, UK. (2003, October). Memorandum by Stephen Plowden: Cars of the Future. Retrieved June 27, 2007, from
http://www.publications.parliament.u...19/319we06.htm
[7] Greenpeace. (2005, December 5). SmILE – Showing Car Companies How it's Done. Retrieved June 27, 2007, from
http://archive.greenpeace.org/climat...rts/smile.html
[8] Bleviss, D. (1988). The New Oil Crisis and Fuel Economy Technologies. New York: Quorum Books
[9] Forza Mondo. (2006, August 20). L'Auto del futuro. Retrieved June 27, 2007 from
http://forzamondo.blogspot.com/2006/...el-futuro.html