I am considering a pair of YS engines for a VQ P-61. The plane should weigh around 20 lbs but the cowls are very small, so compact high-output engines are needed. YS's would fit nicely.

But nobody seems to have a 110 in stock, some websites are saying the engines are temporarily out of production and others indicate delivery by the end of January. What is the scoop on this?

Also how does fuel consumption of the 110 compare against the 91?