As JCL recommended, and i think many people are also in the same boat as i'm, really looking forward to some pros for the computer mod

i have searched (Sylvan Lake V35 helped greatly) and have not found definite answer toward a question that I've been on my mind.


IN YOUR PRESENT EXPERIENCE, DOES THE COMPUTER MOD REALLY HELP THE FUEL EFFICIENCY????

many of you owns multiple cars in the garage, and has many years of driving under your belt, and understood it all about your right foot doing the efficiency, however, like to get some consensus, in the real work, tank to tank, does this mod offer efficiency on the X5d?