[UFO]

Updated my fuel log, trying to be very consistent in maximizing my mileage, no matter the EGR configuration. Unfortunately the temperatures are warmer now, and the traffic always varies. Hopefully the EGR/no EGR differences will average out over the next two tanks before I revert to the "A" configuration.

It seems quite obvious to me that the dominant element in my fuel mileage is how much biodiesel I am running. The weather the past fall is similar to now, but I am now out of biodiesel, and my mileage really took a hit as soon as I ran out. It looks like I may realize some mileage gain without EGR, but I'll have to see. Since the Scangauge is affected by the different MAF reading with/without the EGR functioning, it renders it useless in making the comparison.