Buyers can expect new diesel models from Volkswagen, Porsche, Audi, Chevrolet, Jeep, Cadillac, Mazda, and Ram as automakers respond to rising consumer interest. Diesels achieve about 30% better fuel economy than similar gasoline models, but higher diesel fuel prices and worries about finding stations with diesel fuel have had an impact on sales. Some analysts expect a significant increase in diesel sales when the new models arrive in 2013.