A few months ago I said:
Back to the Yak 52 that some-one mentioned. .... Burns 150 litre per hour when working it though
and several people said that was wrong.
From the June 1997 issue of Sport Aerobatics, the 360 hp M-14 engine in a Yak:
"100% RPM and full throttle for aerobatics .. forget economy ... 40 gph" That's US gallons. I'll leave it to the experts to convert that to litres per hour.
"If you like, you can practice your acro at 82% and drop the fuel burn to 25-30 gph."