Classic British Flight Sim

Currently in Africa with a DC4.

This aircraft struggles to stay up at FL100 at the best of times but these last two flights, cruising at FL90 over Africa, I noticed an OAT between 20 and 30 degrees!

I needed almost TOGA power just to maintain flying speed in the hot temperatures but surprisingly the fuel flow was about two thirds of usual amount ( down to below 500 Kg per hour)

Interesting, are you sure its not a mixture issue?

Mixture is automatic, the JBK series DC4.

Perhaps it is because the majority of flight this type does are relatively short so the additional fuel for take off/climb makes a far greater difference to average flow than a ten hour cruise??