So, I've been running MS for a while now on a turbo 420a with a small 16g, stock cams, 2.0 displacement, trying to get it tuned in.

I noticed cruise speeds are way rich, like 12.8 or so. I've been trying to fix it with auto tuning and making some manual changes, and what I've just now realized is that I'm actually really close to having the AFR match the target AFR of the fuel trim cell I'm cruising in.

The problem is that when I'm in 5th gear cruising I'm at maybe 2200rpm? (Hard to tell actual speed since my speedo is unhooked right now)... anyway, in 5th gear, low throttle, cruise, I'm at like 120% engine load, which equates to about 120kpa, or as some would say "3 psi".

So, my AFR target table is starting to richen things up for safety/knock reasons, but I'm wasting fuel in the process.

So, is this typical to be making boost at cruise on a 420A?