2015 Cummins ISX12G-400 Natural Gas Engine LOW MILES! ISX12 ISX Truck 2015 model year Cummins/Westport ISX12G-400 engine, complete as pictured. REPORTED TO BE LOW MILES -- WE SHOULD HAVE MILEAGE FIGURES SOON -- MORE OF THESE COMING IN !!! GOOD RUNNING TAKEOUTS, COMPLETE AS PICTURED. SAME BOTTOM AS ISX12 DIESEL, SETUP TO RUN ON NATURAL GAS. BEAUTIFUL INSIDE -- GET THIS COMING TODAY !!