Ford, Toyota, and Honda are working with environmental groups like the Natural Resources Defense Council and Union of Concerned Scientists to urge Congress to pass tax credits for people who buy vehicles that are better for the environment. Legislation introduced in the Senate would create tax credits that range from $1,000 for gas-electric hybrids to much more for heavy-duty trucks that runs on electricity or fuel cells. Ford President Jacques Nasser said the bill “will help accelerate demand for cleaner, more fuel-efficient vehicles in the marketplace and put them on the road earlier and in higher volumes.” DaimlerChrysler and General Motors say they support tax incentives, but they disagree with the way the bill calculates fuel improvements. The Sierra Club, on the other hand, supports higher requirements for gas mileage rather than tax credits.