I have an '03 Duramax, rated at 300 HP IIRC.
I pull a head to head horse trailer with it.
I have some liking for extra instruments, so I added a scan gauge II.
This gives me OBD II scans if/when a fault light comes on, I can clear codes while driving, usually early warning of a restricted fuel filter.
It also gives me real time display of 4 extra gauges that I choose from a dozen or so.
I very RARELY use more than 75 HP (25% of the 300 HP rating) when towing.
I should add that SOME of the reason for this is that I am either hauling live animals who (I assume) have no appreciation of acceleration, or I am running empty and don't need much power anyway.
I doubt that I would use much more than 1/3 (100 HP) if I was pulling an inanimate load.
Heck, if it is HEAVY who needs it coming through the back of the cab anyway ?
OK, so I also have this 167 HP motorcycle that is 3 years old now.... and the new models are around 175 HP, with 200 HP (& 200 MPH) foreseeable.
Yeah, I have no need for that much power on two wheels either (-:
We do BUY it though, - - me too.