be regulated equally. However, total mileage overtime must be taken into consideration when considering total emissions volume and there has been investigated in "Dust to Dust" environmental impact, considering factors other than fuel economy. The British national newspaper The Independent reported on a study carried out by CNW Marketing Research which suggested that CO2 emissions alone do not reflect the true environmental costs of a car. The newspaper reported that: "CNW moves beyond the usual CO2 emissions figures and uses a "dust-to-dust" calculation of a car's environmental impact, from its creation to its ultimate destruction." The newspaper also reported that the CNW research put the Jeep Wrangler above the Toyota Prius and other hybrid cars as the greenest car that could be bought in the US. However, it was noted that Toyota disputed the proportion of energy used to make a car compared with how much the vehicle uses during its life; CNW said 80% of the energy a car uses is accounted for by manufacture and 20% in use. Toyota claimed the reverse. The report has raised controversy. When Oregon radio station KATU asked for comment on the CNW report, Professor John Heywood (with the Massachusetts Institute of Technology (MIT)) saw merit in the study saying, "It raises...some good questions" but "I can only guess at how they did the detailed arithmetic.... The danger is a report like this will discourage the kind of thinking we want consumers to do – should I invest in this new technology, should I help this new technology?" The Rocky Mountain Institute alleged that even after making assumptions that would lower the environmental impact of the Hummer H3 relative to the Prius, "the Prius still has a lower impact on the environment. This indicates that the unpublished assumptions and inputs used by CNW must continue the trend of favoring the Hummer or disfavoring the Prius. Since the researchers at Argonne Labs performed a careful survey of all recent life cycle analysis of cars, especially hybrids, our research underlines the deep divide between CNW's study and all scientifically reviewed and accepted work on the same topic." A report done by the Pacific Institute alleges "serious biases and flaws" in the study published by CNW, claiming that "the report's conclusions rely on faulty methods of analysis, untenable assumptions, selective use and presentation of data, and a complete lack of peer review." For his part, CNW's