Van's Aircraft RV-12 Pilot Operating Handbook page 85

Date:12/03/14 Revision:4
FUEL
Octane Rating
91 AKI (premium)
Too low an octane rating will cause pre-ignition and
detonation, which can damage the piston ring grooves, skirt
and crown. Fuel evaporates and quickly loses its octane
rating by osmosis when it lies in a fuel tank or plastic jug. A
premium fuel could see its octane rating drop to unusable
levels after as little as three weeks. A lower octane rating
would have an even shorter usable life.
CAUTION
Use of poor quality fuel or winter blend fuels in hot
conditions may result in vapor lock.
Aviation Fuels
Only use 100LL AVGAS and a proper engine oil. The oil will
need to be changed more frequently, see the Rotax service
manual.
Fueling Procedure
Plane stopped, engine and master power OFF
Ground clamp to exhaust pipe.
Remove filler cap, located right side fuselage aft of rear
window.
Insert fuel nozzle, and add fuel. (Max. 19.8 gallons)
Remove fuel nozzle.
Replace fuel cap.
Remove ground clamp.
Wipe away spillage, if any.
Visually check fuel level.
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RV-12 PILOT'S OPERATING HANDBOOK