CASPER, Wyo. (AP) — A new study of vehicle registrations shows a higher rate of diesel vehicle ownership in Wyoming than in any other state.

Wyoming drivers registered more than 66,000 diesel passenger vehicles last year. The firm R.L. Polk and Company says that accounts for almost 11 percent of all registered vehicles in Wyoming.

Mark Larson with the Colorado Wyoming Petroleum Marketers Association says diesel fuel is easily accessible in Wyoming and provides good towing power for ranching operations.

The same study shows diesel waning in popularity elsewhere amid rising prices for the fuel.

Modern diesel engines are required to meet federal emissions standards similar to those for gasoline engines. Pickup trucks account for most diesel-fueled vehicles but a growing number of cars are diesel-fueled.