I still don't understand the fuel consumption and carburator issue yet but get the engine running correctly first. I would purchase a new distributor module. This was my guess on 11/9. Next, be sure to set the timing correctly using a timing light. If you set it too low, your mileage goes down. If you set it too high ( degrees before TDC ) you will burn up a piston. Time both engines. Capt. George