This tank maybe (says 4.3mph) (max speed was no more than 4.8mph):
http://en.wikipedia.org/wiki/Renault_FT-17
http://www.jaegerplatoon.net/TANKS1.htm
The FT 17 was widely used by the French and the US in the later stages of World War I, after 31 May 1918. It was cheap and well-suited for mass production. It reflected an emphasis on quantity, both on a tactical level: Estienne proposed to overwhelm the enemy defences by a "swarm" of light tanks, and on a geostrategic level: the Entente was thought to be able to gain the upper hand by outproducing the Central Powers. A goal was set of 12,260 to be manufactured (4,440 of which in the USA) before the end of 1919.
After the war, FT 17s were exported to many countries (Poland, Finland, Estonia, Lithuania, Romania, Yugoslavia, Czechoslovakia, Switzerland, Belgium, Netherlands, Spain, Brazil, Turkey, Iran, Afghanistan and Japan). As a result, FT 17 tanks were used by most nations having armoured forces, invariably as their first tank type, including the United States. They took part in many later conflicts, such as the Russian Civil War, Polish-Soviet War, Chinese Civil War, Rif War and Spanish Civil War.
The Soviet Red Army captured fourteen burnt-out Renaults from White Russian forces, and rebuilt them at the Krasnoye Sormovo Factory in 1920. The Soviets claimed to have originally manufactured these Russkiy Reno tanks, but they actually produced only one exact copy, named 'Freedom Fighter Comrade Lenin'. When Stalin began the arms race of the Thirties, the first completely Soviet-designed tank was the T-18, a derivation of the Renault with sprung suspension.