RPMs - Help Settle a Debate

What I miss with DFCO is backfiring while decelerating. My 1988 4 cylinder Toyota Pickup was the last year with regular carburetor, and it sounded really cool!

 

Huh. I'll have to take a look at that. When it comes to that kind of information, isn't the scangauge just displaying what the ECU actually doing? If it can't get that right then the MPG ACT & AVE will be off as well. To get an instant MPG read out, it's just taking real time GPH and factoring in the instant MPH. Then over time, creating an average.

 

I know that in the Chevy Tahoe/Yukon versions in Mexico, two of the injectors in the v8 shut off when coasting(downhill/straight highway) becomes a "v6"

 

Not sure how, but the scangauge is estimating GPH, there is no direct fuel use from OBDII. Must be pretty accurate most of the time, but not with DFCO, and since that isn't a large percentage of total run time it gets adjusted by the fuel adjustment.