[baron]

I have been driving with my Procede V2 for a long time. Just last week, I removed my Procede for service and I noticed that my fuel economy seems to have worsened over the same route to and from work. With the Procede I could easily average 25mpg or better. But now, without the Procede, I struggle to get 24mpg. Is this just a fluke or coincidence, or could the Procede actually benefit fuel economy?

[Tuned335i]

I'm pretty sure that the PROcede allows the engine to run in a more lean condition than stock in cruise. Assuming you can keep your foot out of it, you should see a MPG increase. FWIW, I can't manage any better than 21.5, but that's my lead foot's fault...

[bimmerlex]

It looks like any piggyback helps with fuel economy. I had better mpg with my SSTT over stock, and now it got even better with JB3 over SSTT (not much though, just about 1-1.5mpg)