My Waco has an HS 605 (76 in/oz) on the rudder and 4 HS 425's on the ailerons. It weighs 16 pounds ready to go with dual batteries and switches for battery backup.
These servos have adequate thrust but I do not do 3D. Rolls, loops, Knife edge, spins and snap rolls and hammerhead stalls are my basic routine.
My fuel (Klotz oil and Alky) costs about $2-$3 per gallon for Alky ( Depends on where and when you buy it ) and the last time I bought oil it was $12 per quart. You only use 80% of a quart so my oil cost was Approx $10 per gallon. I have a lot of Mokis so I buy oil in case lots
I love the engines as they have
lots of power after break in (3-5 hours for complete break in) and seem to be dead reliable. I have had one flame out in 10 years of flying them and that was when I installed the wrong plug.
I'm not trying to sell or promote anything, I just like the engines.