WoW Seaweed
That HP article was interesting .
It made me go look at the weight(s). They all four HP rating are the same weight 5070Lbs. and the engines are all 2.9L (3 cylinders) engines. The Hydraulics are all 18.2 GPM. They all have a 18.0 gal fuel tank.
And
What surprised me most was they are all Turbocharged !

3 point lift is 3,192 lbs. on all of them , They all take the same Front-end loader 3967 lbs. max lift.
My round baler only needs 30Hp (600 lb Bale), and my Drum cutter only needs 30HP so Hp is more that enough .
OldFeller , I think your right --- the amount of fuel and RPM rating is the difference, The HP rating ain't gonna matter !
Its still an odd fact !

The 45 HP is up in the $27,000 neighborhood and the 75 Hp is in the $35-36,ooo area . go figure ?