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Western Star Truck Sales offers the availability of the Detroit Diesel DD15 engine for targeted Western Star vocational market segments. The DD15 delivers up to 5 percent better fuel economy than the Series 60 largely due to its turbo compounding technology and Amplified Common Rail Fuel System (ACRS). Turbo compounding, which turns wasted exhaust gas into useable power producing up to 50 bonus horsepower without sacrificing fuel economy, is available only in the DD15. Its ACRS fuel delivery system teams up with DDEC VI electronics to create an optimized combustion event resulting in a quiet, refined operation. The DD15 will also launch a Western Star truck up to 90 percent peak torque in 1.5 seconds because of its simple and reliable turbocharger and dual overhead cams.