The 4.6 is more economical (marginally) than the 4.0 as you are not on the loud pedal as much and only needs feathering - so with that in mind, which would be less stressed - one which you are asking more from it for longer or one that you don't need to poke so much?!?
The 4.6 is more economical (marginally) than the 4.0 as you are not on the loud pedal as much and only needs feathering - so with that in mind, which would be less stressed - one which you are asking more from it for longer or one that you don't need to poke so much?!?