With respect, that confirms the answer is more ambulances and fewer fire trucks, especially when the truck is more expensive to maintain and operate and carries 6 persons when only 2 are attending the patient.
The fire trucks will get roughly the same MPG fuel wise as the ambulance due to engine vs weight issues. Some FD’s use a SUV or utility truck for Medical assist calls like my VFD does. The FD in the case of paid FD’s are already on the clock and they can break away to a fire call if needed. Thus no added cost in employees. LIke I posted the VFD’s in my state respond to many ambulance calls. Most ambulances do not carry forced entry equipment. Also usually only emergency calls result in FD dispatch and some non emergency if Dispatch believes or the crew believes conditions or situation warrants. It’s better to have a full crew and be able to get say a heart attack patient out and on the way than wait for a second assist to arrive.