Don't forget that a substantial amount of fuel is burned while parked. Lights and other electronic equipment consume a lot of energy. "In one recent report abo

Don't forget that a substantial amount of fuel is burned while parked. Lights and other electronic equipment consume a lot of energy. "In one recent report about police vehicle fuel consumption, the cruiser studied was found to idle 60% of the time during normal operation and used 21% of its total fuel while parked. While the engine provided 250 horsepower (hp), together all of the accessories needed less than 2 hp. (Air conditioning consumed the most power, followed by external lighting.)" https://afdc.energy.gov/files/u/publication/idling_emergency-service_vehicles.pdf https://afdc.energy.gov/files/u/publication/idling_emergency...