AFM problems

[AUgreens]

I have a Diablo Sport AFM disabler and when it is plugged in and running on v8 all the time, the fuel economy reading rarely goes to 99 mpg. When it is not in though my mpg reading almost always reads 99 mpg while coasting and shifting down from accelerating. Is there a reason why this is? 

[Hoginedgewood]

Yes

[silveradosid]

all 8 cylinders are getting fuel instead of just 4

[adamj2121]

If you disable AFM your mileage is going to be worse. I don't see how the lesser fuel economy when running all 8 cylinders would indicate an issue.

[nluchau]

I have a range and mine hits 99 all the time while decelling.  

[Loco-diablo]

On 5/4/2018 at 7:17 PM, AUgreens said:

I have a Diablo Sport AFM disabler and when it is plugged in and running on v8 all the time, the fuel economy reading rarely goes to 99 mpg. When it is not in though my mpg reading almost always reads 99 mpg while coasting and shifting down from accelerating. Is there a reason why this is? 

What would you expect? You're always in 8 cyl mode with the diablo plugged in so naturally you'll see the 99 mpg less often (if at all) vs running in AFM mode where 4 cyl mode will show the 99 more often. 

[AUgreens]

I expect the lower MPG but the transmission doesn't act the same. It does seem to "kick" downshift like it did stock. What I mean in this is where it downshifts and I can hear the exhaust "pop"