Have you ever seen them warm up an EMS truck? As soon as those suckers fire its WOT to the accident.....
Yea Jon..... they get warmed up...... while you buckle you seatbelt and turn on the lights and siren........
I do know that some EMS and Fire vehicles have a/the block heater tied into the shore power line, so when the truck is in the bay, and plugged into a cord, the block would be warm. Not saying they get plugged in everytime, but out department plugs everything in at "lights-out" during the day, it can be hit and miss.
But agreed, emergency service is one of the hardest lives there is for a vehicle. Sit in the bay, tones drop, fire it up, driven hard to the scene (a block or 10 miles), parked, left to idle, some have idle controllers so they "high idle" while sitting, then put back to the firehouse and get shut down....
A pumping apparatus will sit, especially if pumping at high idle + the entire time they are pumping.... I have seen incidents where fuel tankers were brought in to refill the pumping apparatus because they had been running so long the trucks were running out of fuel.......