The -6 was quite a bit stronger....I stepped back to the -3 in Spain and surprised myself the first time I rolled the Throttle off simulating an Engine Failure to a young fellow doing his Conversion Course.
I never did like the Aux Tank set up.....where at some point you got to wondering what that Orange Light on top of the Glare Shield was doing shining at you.
More than once I got distracted and pumped my Onshore Diversion fuel over the side. The plus side was the aircraft was noticeably lighter and went a bit faster.
I once passed a Puma that was headed to the Ekofisk.....when asked how I managed to do that.....I just reminded them i was flying a 58-GT.