[Angel And The Wolf]

Originally Posted by Grinder74

With a jack shaft setup you could put one engine in neutral at cruising speeds for better economy.

Or: with Engine Cylinder Deactivation Engine-Cylinder Deactivation Saves Fuel | J.D. Power Cars
and Free Valve technology

https://www.youtube.com/watch?v=OZWeNPi2XkE

I could have the two engines simulate a 500 CC engine for cruising economy: