frequently accelerate 'slingshot' above the nominal low altitude speed limit of 250 KIAS from 5000 feet instead of the ‘standard’ 10000 feet. For the A320, this repeatedly saves 100 Kg of fuel per sector and that’s only over 5000 feet.
Operating in Kuwait,the land of cheap gaz,and going non standard for 5000 feet of supposely fuel saving?
How did you calculate this 100 kgs saving over 5000 feet between 250kts and your 'slingshot' higher speed?
Speed range of 260-280kts save fuel on 320 but not on heavier types such as 330s...higher speed then save fuel..
My low CI friends will need to find 64 Kt of Tailwind that you don't have just to remain equal.
Your cost index friends may just following speeds that their relevant performance officers calculated to be the most 'appropriate' for that flight,using factors that you may not have necessary data or knowledge about.