High Quality Content by WIKIPEDIA articles! The General Motors Precept was a 2000 low emission vehicle concept car aimed at meeting the 80 mpg-US (2.9 L/100 km; 96 mpg-imp) fuel economy goal of the Partnership for a New Generation of Vehicles between the US Government and GM, Ford, and Chrysler. GM was able to meet the 80 mpg-US (2.9 L/100 km; 96 mpg-imp) fuel economy goal with the Precept, creating versions using Lithium and NiMH batteries with diesel, fuel cell and other hybrid version of the car.