Generic Engine and Fuel Consumption Table problem

Hi All, I have torque - power and speed characteristics of an engine and I easily used it to run the engine, but when I am adding the fuel consumption matrix ([12,12]) I will get an error that the torque vector should be always ascending!!

In reality, most of the torque- speed characteristics drop after some point due to the nature of the torque equation T=Power/Speed. Is there any way I can solve this problem in this block? If not, looks like having a fuel consumption table for this block is useless!

Thanks!