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Fuel efficiency in cruise

C172RG: 28-30l/hour @ 125kts = 0.22 - 0.24l/nm C182RG: 41l/hr @ 155kts = 0.26l/nm

Both cases rentals, flown in the 7500 - 9500 ft range

C172RG: 28-30l/hour @ 125kts = 0.22 - 0.24l/nm C182RG: 41l/hr @ 155kts = 0.26l/nm

Which altitude? Are those POH numbers? The C182RG number doesn't look correct to me.

No, these are real figures. As stated, flown in the 7500-9500 ft range (no O2), leaned. The 182RG I fly is non-turbo. There is no fuel totalizer , but that's the figure I've been seeing on long x-country flights. Mind you, I flight plan for 13gph, but in reality tend to see around the 11- 11.5gph mark.

No, these are real figures.

How do you determine the TAS? I don't think the figures are correct, at least not according to the POH and normally the POH is not known to be pessimistic about cruise speed...

PA28 FL100 120kt TAS @ 7 GPH/27 LPH 0.26 litres per nm

achim, I know what you mean, these figures are indeed surprisingly good, i.e. slightly better than POH. I should add, however, that this particular a/c has a brand new engine and prop. I'll fly her again in a few weeks when back in the US and will try to get precise figures. Will report back then.

Cirrus SR20. Cruise 150/155 ktas

I've used data from the last 200 flights, including the consumption on ground but only the real flight time. Most of the flights are done ROP between 75-85% power, and data include a good amount of short flights. These are the mean values:

46.37 l/h 0.363 l/nm 0.091 l/nm/p

Taking only 6 flights that were done 65% power LOP, these are the mean values:

38.63 l/h 0.3072 l/nm 0.0768 l/nm/p

They would be slightly better figures if I'd had taken only cruise situation, but is more realistic to take into account the whole flight, taxi, climb, etc included. Take it as a 'worst case scenario'

LECU - Madrid, Spain

Cessna Caravan Cargomaster;

FL100, Tq 1500, RPM 1600, 300 lbs/hour and about 160 KTAS. So that would equate to: 170 l/h, 1.0625 l/nm

Just in case anyone is considering purchasing what must be the greatest flying SUV there is.

ESSB, Stockholm Bromma

l/nm
Citation V Encore 1.33
PA44 0.71
P46T 0.56
PA23-250 0.50
Jetprop DLX 0.44
C206H 0.34
SR22T 0.33
PA30 0.31
TR182 0.29
P28R-200 0.29
C210 (na) 0.28
SF260 0.28
AC11 0.27
TB20 0.26
SR20G3 0.26
C182RG 0.26
PA28 0.26
M20C 0.24
C172RG 0.24
PA18-95 0.23
RV-8 0.15

EGTK Oxford

l/nm/seat
PA44 0.18
Citation V Encore 0.15
PA18-95 0.12
P46T 0.09
PA23-250 0.08
SR22T 0.08
PA30 0.08
RV-8 0.08
Jetprop DLX 0.07
TR182 0.07
P28R-200 0.07
SF260 0.07
AC11 0.07
TB20 0.07
SR20G3 0.07
C182RG 0.065
PA28 0.07
M20C 0.06
C172RG 0.06
C206H 0.06
C210 (na) 0.05

EGTK Oxford
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