800XP LRC
I agree with the above. Don't try and be tempted to get to FL410 (FL430 on my XP) too early. Let the wings get to no more than 5400 before attempting. Also try and keep the first hour burn to 2000lbs. ISA is a big deal on Hawker. 6hr 40m is the best I ever got with 1500 landing fuel. Great aeroplane 25 years of fun.