I was a deputy in a huge county - land-wise. I once had to run hot (Code 3, 10-100, whatever your regional preference) for apprx. 65-70 miles late at night in very rural, sparsely populated country on a nice, straight highway. Upwards of 100+ mph (at times) for what seemed forever. Many miles before I got to the scene, my electronic siren just kinda gave up and died. I finished the rest of the trip with the sound still in my ears, but I don't think anyone outside the car could hear it!
By the way, running hot is exciting ... at first. By the time I finished that run, I was exhausted ... from the stress and strain. Later in my career, I gradually came to realize that you often actually got places faster when you could leave the dang siren and red/blue lights off!