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#1
July 5th 04, 10:29 PM
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FWIW
180 hp M20C (carb'ed) run 600 hrs mostly x-c at 75% 9.5-10 gph cruise trips of 1.5-2.5 hours typical Flight Fuel Flow average 9.1 gph (total fuel / flt time) as measured by Garmin 196 Tach Fuel Flow average 8.5 gph (total fuel / total tach)as measured by Horizon electronic tach No Hobbes to compare YMMV Rule of thumb for piston engines: divide rated HP by 18 to get cruise fuel flow. Assumes about 75% power and proper leaning. IE, 230 HP is about 12.7 gal/hr. 
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