Firstly you will need to change your Pprune name.
I couldn't agree more!
Spot on post by
Richo. I fly a B200 in the tropics and, when below 18,000 feet (our FLs start at 210), adjust power to achieve a fuel flow of 600PPH. Tends to make you a bit slower in cruise, but I don't often have to cruise so low. However, I do lots of ops below 5,000 feet and, even configuring approach flaps and 150 knots (10 knots above gear warning horn speed), fuel flow is very high and the area behind the exhausts gets pretty black.
For profile descent, need to keep an eye on turbulence. You're limited to 170 knots there, which neatly mucks up a descent that was planned at 240 knots.
Our freezing levels are pretty high and I can often slide around a bit of cloud, to avoid using the ice vanes. That means I can stay above 140 knots, but might still be limited to 170 knots for turbulence.