So, I've been poking around at possible long-term upgrade airplanes, and was looking at the TBM.

On one particular site: http://www.newavex.com/performance.htm, they have some performance data, and it seems incredible. And by "incredible", I mean "not at all believable".

Click on that link, then click the takeoff performance bullet. The ISA day, sea-level performance seems pretty reasonable. The ISA+10 numbers are horrible. I couldn't fly a max gross TBM850 out of a sea-level 4000' strip with a 50-foot obstacle on a day where it was 77*F on the ramp?

I've never flown a turbine (other than in the sim at the 737 ATOP school), but are turbines that temperature sensitive?

Not that bad in my experience, but the bulk of my time is in ridiculously overpowered military Turboprops.

Like 12,000 hp for 50k gross.

I agree those numbers seem off. The 850 is limited to 700hp for takeoff so it should have an enormous temp reserve.

These numbers are wrong.
I takeoff all the time at max gross from my 3400' runway at any temperature.
C2 and 850 have the same takeoff performance.
ISA+10 gives me 2165 gr and 3020 to clear 50' obstacle.
You would never be temperature limited on takeoff.
I wait till airborn to put bleed on. That keeps temps down will taxiing.