I have an EF 68" Yak and a Yellow 74" Edge that I fly with a Saito 1.80. I love the performance of the Saito, but this engine is a huge fuel hog.

I would like to replace the Saito with a gas engine, but am not sure if these planes are big enough to take the weight addition. I really like this size range of 70" or so wing spans and want an engine that can preform 3D without breaking my wallet in fuel costs.

Would a Zenoah G26 be enough engine for 3D without adding to much weight? Are there any other gas engines out there that I should consider?

Thanks in advance.