Re-Calibrating MPG Display

[907DAVE]

Ok..... so going out on a limb here, can you calibrate the Average MPG display? There must be a Fuel Flow map in the PCM that controls this, but can it be changed? The reason I ask is because after switching to Hybrid injectors my display has been almost exactly double the actual mileage. Looks pretty sweet when it shows 40 mpg, but not very practical. I assume it's because the injectors moved twice as much fuel as before. With stock injectors it was pretty darn accurate, and kinda nice for road trips. Made it easy to estimate fuel stops and helped me adjust driving styles for better economy. I guess it would take alot of trial and error to get it close but would be worth the effort.

Any ideas?