28pci, 24.5mm venturi jetting

[jz56oval]

Hey all

I have a stock 36hp with 28pci. Thought I'd add a bit more pep to it by adding a 24.5mm venturi and a 145 main jet with 180 air correction. So far after a tank of fuel has gone. It came out to be 11.4 MPG. I was at around 25mpg before with stock set up. I tried a 140 main jet with 180 air and there was a lack of power at higher cruising speeds or higher rpms at some points.

The 145 main and 180 air still hde a bit of power loss but most of the time it runs great but it bothers me that the mpg has gone way down.

Would adding a larger air correction jet help this issue or keeping the 180 air and adding a 135 main?i I'm in the bay area, CA. at about 300 - 400 feet above sea level.

Any help would be appreciated.