How does Yosh or Teka change MPG?

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How is fuel economy on a V-Strom 1000 impacted by using a Yosh box to increase idle by +1.5% and the low end by +5%? (all other factors being equal).

Does making a similar change with a Teka box change MPG about the same amount?

How about if a Power Commander is used to make the equivalent change (+5% on the low end)? What is the MPG impact in that case?

Thanks,
John

[sempervee]

I installed a DFO (Digital Fuel Optomiser) on my 03 DL1000 after installing a set of Scorpion pipes. After 2 adjustments I am very happy with the power and smoothness. My Milage has gone from
an average of 42 to 38, but that is the hit one takes when adding more fuel into the equasion. The scorpion pipes breath more freely than the stock exhaust, necessatating a richer mixture.
The OEM setting was on the lean side anyway. I may be running just a touch rich, but that is better than lean.