INDIANAPOLIS, July 24, 2024 /PRNewswire/ -- Allison Transmission has partnered with Cummins to test and validate the new Cummins X15N 15-liter natural gas engine paired with the Allison 4000 SeriesTM fully automatic transmission. Sandman, a bulk cement hauling fleet based in San Jose, California, has successfully completed over 50,000 miles of vehicle testing in the field and reports significant improvements in fuel efficiency and performance. The test vehicle, a Peterbilt tractor pulling double trailers of ...