Gale Banks upgrade on Workhorse w22 with 8.1 GM

"Since I monitor my engine continuously with my ScanGauge I can see if my Air/fuel ratio varies from 14.7 to a lean condition"

Based on my observations, very few consumers would do this. Most it appears are hard pressed to do anything other than put fuel in the tank and turn the key. Minor upgrades to the ECM are one thing, the problem is you get very little with minor upgrades to the ECM, certainly not enough to justify their expense.