In regards to the FG-90's fuel consumption... I sent that question to Horizon's "tech support," letting them know I had purchased the engine new from Horizon (also two FG-60s - which I also asked about fuel consumption)
Their answer?
"Saito does not list fuel consumption on its motor specifications."
My mental response?
DUH!!!!!!!!!!!! I can read the Owners manual and product specs.
WHY do you think I am asking you guys?