N941WR
Legacy Member
I'm very confused by the GPH numbers I have read on this forum.
Dan (and other's), please add your $.02.
My O-290-D2 manual states it has a 75% power fuel burn of something like 7.1 GPH. I seem to remember an O-320 powered C-172 I used to fly burning 9.6 GPH.
Am I being naive in that the engine doesn't know what airframe it is in and that 75% power and the resulting fuel burn should be the same for the same engine?
Are people not flying at a 75% power, but 65 to 70%?
I understand the advantages of fuel injection and electronic ignition over carbs and mags, is that what is causing the differences? (My rule of thumb is 5% for each.)
Dan (and other's), please add your $.02.
My O-290-D2 manual states it has a 75% power fuel burn of something like 7.1 GPH. I seem to remember an O-320 powered C-172 I used to fly burning 9.6 GPH.
Am I being naive in that the engine doesn't know what airframe it is in and that 75% power and the resulting fuel burn should be the same for the same engine?
Are people not flying at a 75% power, but 65 to 70%?
I understand the advantages of fuel injection and electronic ignition over carbs and mags, is that what is causing the differences? (My rule of thumb is 5% for each.)