Governor Type

[Lonestar10]

Can anyone explain the differences between the 2 governor types in features/parameters

I have
Automotive
And
Variable Speed

my truck was Automotive but i set to Variable speed to see if there's any change this week to how the engine acts.

ive tried some searching and only found a saying in truckers report that variable speed is like driving a mechanical cat..as ive only driven a 3406E i dont really know the difference except in the golden days of yesteryear a mechanical engine would just throw more fuel the more you pushed the pedal compared to computer control

thanks for any input!