Originally Posted by LBreezie
How so? If it is up to emission standards why does the government care?
Because there are penalties if GM doesn't meet the Corporate Average Fuel Economy rules. Essentially this won't be much of an issue with the Z/28, since the number of units build will be tiny. GM builds a lot of Cruzes, etc., that offset the lower mileage, but the real issue are things like trucks and SUVs -- the huge number of units sold there make a big impact and are much harder to balance out...