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!