Biofuels compatibility and Alternative fuels The liquid-cooled, 3-cylinder MaxTorque™ engines used in Grasshopper models are compatible with B5 diesel, which means that up to 5% of the diesel fuel mix can be from non-petroleum, renewable resources. So not only does the diesel-powered product allow you to complete mowing jobs using less fuel, but the fossil-fuel savings are increased by an additional 5% with B5 fuel blends. Alternative fuels including wind, solar, ethanol, natural gas, diesel and propane are taking their rightful places in the overall energy supply chain, but landscape and mowing professionals must rely on performance and proven technology to dependably deliver the services their customers depend on. This is why diesel rises to the top of the list of energy alternatives, as it is clean, powerful, readily available and dependable. NOTE: Propane is a byproduct of crude oil and natural gas refining. As a byproduct, propane is not an alternative to fossil fuel consumption and does nothing to reduce dependence on volatile fuel producing nations. Request more information about Grasshopper diesel mowers