I have to disagree with most, providing you run a cold Power Plant.
I run a Phantom with size 5 fuel scoop and a cold ship(PP is Low Emissions/Thernal Spead). Just did over 90000 LYs going to Beagle Point(in a roundabout way) and not only does it scoop fast enough to honk-scoop-jump(which I did about 20% of the time), but at max scoop rate my heat never hit 70%, even if I stop dead by the star.
p.s. My scoop method is skim round star at max throttle
See, this was something I
did look at for my Exploraconda.
I think I worked out (via Coriolis) that it'd require a PP two sizes larger to produce the same power (Overcharged 3A vs Low Emmisions 5A).
Fitting that would allow me to engage my FSD while in the red-zone but it'd also reduce the jump-range of my ship by 2.5Ly.
A ship that has a G5 Light Weight HSL, just to
improve the jump-range by 0.1Ly and which also has a 4G SRV bay which requires more power than a 7A Fuel Scoop.
Seems like I'd be reducing my jump-range by 2Ly for no power-saving and the only "benefit" would be that I could engage my FSD
while scooping instead of scooping faster and
then engaging my FSD.
More often than not, I tend to find that (when honk-jumping) I've completed scooping and exited the red-zone
before I'm pointing at my destination system, anyway.
It's the steering that dictates how long I'm in a system rather than the scooping
or the FSD cool-down.