Motor Coach Industries, Inc. submitted a model D4500, CNG-powered 54 seat/45-foot bus, for a partial STURAA test in the 12yr/500,000 mile category.  The Federal Transit Administration determined that the following test would be performed:  4.1 Performance Test, 4.2 Brake Test, 6. Fuel Economy Test, 7.1 Interior Noise Test, 7.1 Exterior Noise Tests and 8. Emissions.  Testing started on June 1, 2015 and was completed on July 14, 2015.  The Check-In section of the report provides a description of the bus and specifies its major components.


The interior of the bus is configured with seating for 54 passengers including the driver.  Note: this test bus is not designed to accommodate standing passengers.  At 150 lbs. per person, this load results in a measured gross vehicle weight of 47,530 lbs. 


The performance of the bus is illustrated by a speed vs. time plot.  Acceleration and gradeability test data are provided in Section 4, Performance.  The average time to obtain 50 mph was 26.88 seconds.  Top speed obtained on the dynamometer was 70.6 mph.  The Stopping Distance phase of the Brake Test was completed with the following results; for the Uniform High Friction Test average stopping distances were 28.87’ at 20 mph, 63.02’ at 30 mph, 96.39’ at 40 mph and 120.20’ at 45 mph.  The average stopping distance for the Uniform Low Friction Test was 35.73’.  There was no deviation from the test lane during the performance of the Stopping Distance phase.  During the Stability phase of Brake Testing the test bus experienced no deviation from the test lane but did experience pull to the left during both approaches to the Split Friction Road surface.  The Parking Brake phase was completed with the test bus maintaining the parked position for the full five minute period with no slip or roll observed in both the uphill and downhill positions.


A Fuel Economy Test was run on simulated central business district, arterial, and commuter courses.  The results were 0.40 M/lb., 0.54 M/lb., and 0.95 M/lb. respectively; with an overall average of 0.52 M/lb.


A series of Interior and Exterior Noise Tests was performed.  These data are listed in Section 7.1 and 7.2 respectively.


The Emissions Test was performed.  These results are available in Section 8 of this report.

Number: 1503-P
Model: D4500
Vin Number: 1M8PDM3A9FP013751