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**chuckster57** · 09-13-2017, 12:19 PM

Computer controlled engines have the ability to change fuel/air ratio on the fly. In simple terms, OBD II was mandated in 1996 and it is one computer controlling a number of different systems. I can't remember right now how many times a minute it would "adjust" things. C.A.N. was mandated in 2006 (if I remember right), and had a number of computers that communicated with a central computer. If my mind is still working, I believe it made adjustments 60X a second.

With all that in mind, a 1MPG difference may be explained away in any number of ways.

09-13-2017, 12:19 PM	#5
chuckster57 Site Team Join Date: Jul 2014 Location: Modesto Posts: 20,327	MPG at Altitude (Gas) Computer controlled engines have the ability to change fuel/air ratio on the fly. In simple terms, OBD II was mandated in 1996 and it is one computer controlling a number of different systems. I can't remember right now how many times a minute it would "adjust" things. C.A.N. was mandated in 2006 (if I remember right), and had a number of computers that communicated with a central computer. If my mind is still working, I believe it made adjustments 60X a second. With all that in mind, a 1MPG difference may be explained away in any number of ways. __________________ 2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel. Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS. Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.