Government officials are promoting the purchase of efficient vehicles in conjunction with Expomóvil, a car show, that will run until March 13 at the Centro de Eventos Pedregal.
Ministerio de Ambiente y Energía originated the program last year and has tightened the requirements this year.
The designated vehicles weight up to 1,800 kilograms, a bit less than 4,000 pounds. They also should emit 180 grams of carbon dioxide or less per kilometer and attain at least 15 kilometers per liter of fuel. That is about 35 miles per gallon.