Arizona Aviator
Member
Just did a XC (3.5 hrs each direction) in the -12. On the flight out, I burned 3.2 to 3.4 GPH in level cruise. On the return flight, I burned 4.4 to 4.5 GPH in level cruise. These measurements were taken from the Dynon D180. I've wracked my brain to figure out what caused the significant increase in GPH. Each flight was nearly identical. Same altitude, same power setting, same time of day (similar temps). The only difference between the flights I can think of was that I burned 91 octane auto fuel on the way out, and 100LL on the way back.
Would the higher octane cause the 912ULS to run richer? Or, any other ideas why it would burn 1+ GPH more during cruise on the return flight? I'm beginning to question the accuracy of the D180 since its "fuel remaining" numbers always disagree with the graphical representations of fuel remaining.
Would the higher octane cause the 912ULS to run richer? Or, any other ideas why it would burn 1+ GPH more during cruise on the return flight? I'm beginning to question the accuracy of the D180 since its "fuel remaining" numbers always disagree with the graphical representations of fuel remaining.