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ProStar® ES With the SmartAdvantage™ Powertrain Tops in Fuel Efficiency

ISX15_SmartAdvantage - LargeThe International® ProStar ES is one of the most efficient trucks on the road today. It features the lowest wind-averaged drag coefficient in the industry, with roof fairings, side extenders and a wraparound chassis skirt all contributing to a significant improvement in fuel efficiency (up to 12.5%, 4% and 3.25% respectively, over that of comparable trucks without these features). This can yield thousands of dollars in annual fuel savings per vehicle for typical long-haul trucking fleets. The aerodynamic features of the ProStar ES also help provide greater stability in crosswind driving conditions.

The standard big-bore engine offered in the ProStar ES is an ISX15 450SA. SA stands for the SmartAdvantage Powertrain, a totally integrated package that combines the Cummins engine with an Eaton® Fuller Advantage® 10-speed automated manual transmission (AMT), to deliver 3-6% better mpg over conventional powertrains. Advanced SmartTorque2 technology delivers 1550 lb-ft (2102 N•m) of torque during normal operation, but unleashes up to 1750 lb-ft (2373 N•m) of peak torque when the engine load demands it. Extra torque helps drivers maintain road speed on uphill climbs, with fewer shifts, for better fuel economy and less driveline wear. A naturally aspirated air compressor (NAAC) reduces parasitic load on the engine, further boosting fuel economy.

The powertrain is connected to the drive wheels using a Spicer® AdvanTEK® 40 (6×4 applications), a Meritor® 14X™ (6×4 applications) or a Meritor FUELite™ (6×2 applications). Recommended rear axle ratios are 2.64 for vehicles running 65 mph, or a 2.79 gearing for fleets with a 62 mph speed standard.

The ProStar ES is currently available in 73-inch Sky-Rise Sleeper, 73-inch High-Rise Sleeper, 56-inch High-Rise Sleeper and Day Cab configurations. A 400-hp rating for the ISX15 engine within the SmartAdvantage Powertrain will be available later this year.

For more about the ProStar ES, visit

For details about the SmartAdvantage Powertrain, see

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