Re: Fuel consumption and SAT
V/S, it really depends what you’re asking. If you’re at high level, and choose to fly constant mach which is above the max range mach, then flying into warmer, or colder air, will have almost zero effect on the specific range, ie the distance per weight of fuel burned. Looking closely at two business jet's fuel figures, it does seem to be VERY slightly more specific range at the colder temperatures though.
Hawk