Ok, I ventured inside the beltway today... I went to Alexandria. Got pleanty of practice DFCO'ing at traffic lights in a completely urban environment. By carefully and progressively downshifting I can keep DFCO going down to about 5-10 MPH. SG was reporting 18 MPG average on my urban driving with DFCO. Not sure how accurate that's going to be because I've already established that SG doesn't know what's going on with DFCO in my truck. Going 55MPH on urban highways inside the beltway have few opportunities to DFCO because of heavy traffic.
Once I got on the toll road on my way out of town I again set the cruise at 60. I'm thinking 60 is probably the most efficient speed in the truck. I used to think that the slowest speed possible and still be in OD would have been best. I don't think so now. If you touch the pedal, or loose speed it drops down to 3rd gear - something we want to avoid. 55 is good, but its borderline whether or not DFCO will kick in when the cruise lets off the throttle. @ 60 you are going fast enough that you can stay in OD, even if you give it some throttle or loose some speed. Plus 60 is fast enough that if the cruise lets off the throttle for more than 3 seconds it DFCO's. There was one stretch where I was able to maintain DFCO for almost a whole mile.
I'm still wondering if there is some setting in SG to make it realize I'm in DFCO and reflect that in the instantaneous mileage.
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Linear Mode
