MIAMI-DADEDISTRICT SCHOOLS

BEFOREBEFORE

the

Final Decision

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

DIESEL VS. CNGMDCPS 2011/2012

DIESEL CNG

Cost per bus w/options$93,884

77 conv. Blue Bird $145,301

Fuel cost/equivalent gallon $3.47 $2.20/EQ

Miles/equivalent gallon 7 5

Additional cost per fueling station 0 1,000,000+

Type of bus on bid All "D" Transit style only

Fueling time 5-8 minutes 15-20 minutes fast fill

Bus range/tank700 miles100 gals

300 miles7,600 cubic feet

EmissionsNOx = 0.2

Particulates = 0.01 gm/bhp-hrNOx = 0.2

Particulates = 0.01 gm/bhp-hr

DIESEL• $93,884/15 years = $6,259

12 years = $7,824

Average fuel cost/year• 16,545 miles/7MPG X $3.47 = $8,202

• Annual cost/15 years = $14,461$14,461 12 years = $16,026$16,026

• $145,301/15 years = $9,686 12 Years = $12,108

Average fuel cost/year

16,545 miles/5 MPG X $2.20 = $7,280

• Annual cost/15 years = $16,966$16,96612 YEARS = $19,388$19,388

CNG

DIESEL

12 YEARS

$16,026

15 YEARS

$14,461

CNG

$19,388 $16,966

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

• 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.”

• 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 Diesel ISL-G CNG400,000 Mile Life Cycle 600,000 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)

• 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