Cat Lift Trucks’ DP40N1-DP55N1 Series of 8,000-12,000 lb. capacity diesel pneumatic tire lift trucks are designed to meet the U. S. Environmental Protection Agency’s Tier 4 final emissions standards. The diesel engine provides a 21.6% increase in fuel efficiency in addition to increased performance, reduced emissions levels and a lower total cost of ownership. The diesel particulate filter (DPF) will automatically regenerate during normal operation, so there is no work cycle interruption, even at low engine speeds. In addition to the 90% reduction in particulate matter and the nearly 50% reduction of NOx, the diesel-powered engine also features an improvement in fuel consumption – up to 21.6%.