Green Vehicles Workshop & Showcase
Fleet Experiences and Barriers
Jeffrey A. Tews, CPFP
Fleet Operations Manager
City of Milwaukee Department of Public Works
Operations Division, Fleet Services Section
Diverse Fleet
123 different types of equipment, from aerial lifts to welders
City of Milwaukee Fleet:
– Diesel units 929 pieces
– Gasoline units 1,670 pieces
– Propane units 138 pieces
– CNG Units 29 Pieces
– Non-Fuel units 995 pieces
Annual Fuel Use:
– Diesel fuel 1,000,000 gallons/year
– Gasoline 600,000 gallons/year
– Propane 17,000 gallons/year
– CNG 165,000 DGE’s
1980, 1992 CNG Initiatives
Low Power
3,000 PSI
Conversions
Slow-Fill Station
Short Range
CNG Equipment
21 Refuse Packers w/Plows
22 more Refuse Packers on Order
5 Cargo Vans
3 Mid-Size Cars
CNG Snow Plowing since 2010
CNG Fueling Stations
Compressor drives both public and City access Dual 250 Hp electric motor driven compressors
Two 3-stage storage cascades
CNG Fueling Stations
Front – Public Access 3000 / 3600 PSI
Credit card access only
Open 24/7
CNG Fueling Stations
Rear – City Access
3600 PSI
Employee card access
RFID or Mag-Stripe
CNG Fueling Stations
Slow-Fill
16 Vehicles
Block Heaters
Sequential Fill
CNG Problems
Leaks at Cascades
O-Ring
Relief Valves
Leaks in Systems
Relief Valves
ESD Switches
Connected Drive-Offs
EV Equipment
1 Plug-In Hybrid Car
– 11,586 miles per year
– Previous gasoline 23.48 mpg
– Current MPG: 277.7
16 Hybrid Cars
– 8,119 miles per year
– Previous gasoline 23.5 mpg
– Current MPG: 36.9
19 Hybrid SUV’s
– 8,602 miles per year
– Previous gasoline 18.48 mpg
– Current MPG: 25.3
Thank You!