Since I bought my wife her Suburban, the AFM system was driving us crazy! It would kick in and out and cause a terrible exhaust drone that bothered everyone. Since purchasing the Range AFM Disable Device, we actually enjoy taking the Suburban out and getting constant and consistent V8 power. Gas mileage has stayed about the same @ 18.5 mpg but without the lag of the AFM kicking in and getting "tripped up" on itself and not shifting correctly. I highly recommend this product!
Fuel Management Devive
This worked exactly as advertised, much smoother driving without the changing from 8 to 4 cylinders and back to 8 again. I haven't driven much to tell the difference in mileage yet, driving to Florida in two weeks so will know more after that. I would expect oil consumption will go down as well. I would recommend this to anyone who has the fuel management system on their truck.