1. MIAMI-DADE DISTRICT SCHOOLS BEFORE the Final Decision

2. THINGS TO CONSIDER Initial cost of the bus Residual value Infrastructure costs & accessibility MPG equivalents/fueling times/fueling frequencies Emissions Training (drivers & mechanics) Fuel availability, cost per equivalent gal, domestic vs. foreign Examples of success User satisfaction Reliability, warranty and parts support Accuracy of proposals Cost effectiveness

3. DIESEL VS. CNG MDCPS 2011/2012 DIESELCNG Cost per bus w/options $93,884 77 conv. Blue Bird$145,301 Fuel cost/equivalent gallon$3.47$2.20/EQ Miles/equivalent gallon75 Additional cost per fueling station01,000,000+ Type of bus on bidAll"D" Transit style only Fueling time5-8 minutes15-20 minutes fast fill Bus range/tank 700 miles 100 gals 300 miles 7,600 cubic feet Emissions NOx = 0.2 Particulates = 0.01 gm/bhp-hr NOx = 0.2 Particulates = 0.01 gm/bhp-hr

4. DIESEL $93,884/15 years = $6,259  12 years = $7,824 Average fuel cost/year 16,545 miles/7MPG X $3.47 = $8,202 $14,461Annual cost/15 years = $14,461 $16,026  12 years = $16,026

5. $145,301/15 years = $9,686  12 Years = $12,108 Average fuel cost/year 16,545 miles/5 MPG X $2.20 = $7,280 $16,966 Annual cost/15 years = $16,966 $19,388  12 YEARS = $19,388 CNG

6. DIESEL 12 YEARS $16,026 15 YEARS $14,461 CNG $19,388$16,966

7. ADDITIONAL ITEMS TO CONSIDER Tanks on CNG bus needs changing every 10 years Additional 5 year warranty on CNG engines costs $5,800, Diesel costs $800, not available for propane Shops have to be retro-fitted for CNG I.E. explosion-proof lighting, methane detection sensors on ceilings, exhaust fan installation

8. Maintenance schedule for Diesel is less frequent than for CNG engine (Cummins) Per a June 2010 publication from the National Renewable Energy Laboratory, U.S. Department of Energy – “At The End of a Vehicle’s Life, a CNG Vehicle is Worth No More than a Diesel Vehicle.”

9. Assuming that MDCPS buses travel 16,545 miles annually (per MDCPS 5 Year Transportation Plan), and are resold after 12 years in operation, then the residual value of the ISL-G CNG will be $96,869, and the ISB Diesel will be $46, 952 – a difference of $49,917. See below for MDCPS Residual Value breakdown. ISB DieselISL-G CNG 400,000 Mile Life Cycle600,000 Mile Life Cycle 24 year life (400,000 miles/16,545)36 year life (600,000 miles/16,565) $3,911 Annual Depreciation ($93,884/24)$4,036 Annual Depreciation ($145,301/36) $46,932 Total Depreciation @ 12 yrs ($3,911 x 12)$48,432 ($4,036 x 12) $46,952 Residual Value ($93,884-$46,932)$96,869 ($145,301-$48,434)

10. Gather as much information as you can find regarding applicable use of the product Carefully check the information as it relates to your application Run the numbers and make your OWN decision