Automotive expert witnesses may opine on automotive design, automotive technology, fuel economy and related aspects of the automotive industry. In the news, automakers Hyundai and Kia have agreed to pay a $100 million civil penalty to resolve alleged Clean Air Act violations. An EPA investigation found that the companies touted lower gas mileage and greenhouse gas emissions on 1.2M vehicles than test results showed. In a large number of tests, both Hyundai and Kia chose favorable data rather than average results. In certain cases, Hyundai and Kia relied predominantly on data gathered when test vehicles were aided by a tailwind.
In a 11/03/2014 press release, the EPA states:
United States Reaches Settlement with Hyundai and Kia in Historic Greenhouse Gas Enforcement Case
The U.S. Environmental Protection Agency (EPA) and the U.S. Department of Justice today announced an historic settlement with the automakers Hyundai and Kia that will resolve alleged Clean Air Act violations based on their sale of close to 1.2 million vehicles that collectively will emit approximately 4.75 million metric tons of greenhouse gases (GHG) in excess of what the automakers certified to the EPA. The companies will forfeit GHG emission credits in order to put the companies in the place they would have been had they accurately reported the GHG emissions from these vehicles in the first place. The companies also will take measures to prevent future violations. On November 3, 2014, the EPA and the U.S. Department of Justice (DOJ) announced this settlement, and lodged a consent decree embodying the settlement in the United States District Court for the District of Columbia. The California Air Resources Board joined the United States as a co-plaintiff in this settlement.
Additionally Hyundai and Kia gave consumers inaccurate information about the real-world fuel economy performance of many of these vehicles. Hyundai and Kia overstated the fuel economy by one to six miles per gallon, depending on the vehicle. Similarly, they understated the emissions of greenhouse gases by their fleets by approximately 4.75 million metric tons over the estimated lifetime of the vehicles.
The EPA subsequently investigated the coastdown test protocol Hyundai and Kia used to measure the road load force of their vehicles. That protocol appears to have included numerous elements that, once aggregated, generated inaccurately low road load forces. For example, Hyundai and Kia restricted their testing to a temperature range where its vehicles coasted farther and faster and prepared vehicle tires for optimized results. In processing test data, Hyundai and Kia chose favorable results rather than average results from a large number of tests. In certain cases, Hyundai and Kia relied predominantly on data gathered when test vehicles were aided by a tailwind.