2. Matt Stewart Reducing Idling in the City Fleet
City of Chicago
Matt Stewart
Reducing Idling in the City Fleet

3. Idle-reduction Human Factors
Idling is almost entirely human choice, even after modifying vehicles for engine-off operation
2006 policy
Five-minute limit for all city vehicles
2010 municipal ordinance
Three-minute limit for all on-road, diesel-powered vehicles
Stickers, keychains, etc.
Eco-driving training

4. Idle-reduction Technology
Hybrid vehicles
Eliminating idling more important than propulsion efficiency
Heaters
Coolant heaters
Air heaters
Five-minute idle-shutdown timers
Aftermarket timers on MD/HD trucks
Factory shutdown option

5. Tracking Idling Fuel usage GPS data
Compare change in fuel consumption over successive years while controlling other variables
Timed coolant heaters: 12.6% difference in GPM change from one winter to the next versus trucks without heaters, saving 25,000 fuel gallons
GPS data
Millions of records; system not designed for this
Argonne team has been able to find some impact of idle-reduction efforts